Why Modern Wars No Longer End

The world’s biggest wars are increasingly difficult to win. That does not necessarily make them easier to end.

Russia has failed to conquer Ukraine, but still believes military pressure can improve the terms of any eventual settlement. Ukraine has prevented Russian victory but sees a ceasefire without credible security guarantees as a potential interval before another invasion. The United States and Iran have repeatedly moved between military confrontation and negotiations without resolving the sanctions, nuclear, maritime and regional-security disputes driving their conflict. Israel and Hezbollah have accepted ceasefires while continuing to disagree over Israeli deployments, Hezbollah’s weapons and who ultimately controls southern Lebanon.

Again and again, diplomacy reaches the same obstacle: neither side can obtain everything it wants militarily, but neither believes it has lost enough to accept what the other side demands.

Conflict-resolution scholars have long described one potential opening for negotiations as a “mutually hurting stalemate” – the point at which adversaries conclude that continuing the conflict is both costly and unlikely to produce a better outcome. Yet even the theory’s proponents have argued that pain alone is insufficient. Research on how negotiations end emphasizes that stalemate must also be accompanied by a credible political alternative that both sides consider preferable to continued fighting. Without that second condition, negotiations are more likely to manage a conflict than end it.

Stalemate Is Not the Same as Ripeness

The battlefield in Ukraine illustrates the distinction.

Russia’s full-scale invasion has entered its fifth year without achieving Moscow’s original objectives, while Ukraine has been unable to restore all of its internationally recognized territory by force. The apparent military stalemate has generated repeated diplomatic initiatives, yet negotiations continue to run into the same fundamental questions: territory, Ukraine’s future security architecture, the terms of a ceasefire and the risk that Russia could use any pause to rebuild its forces.

In July, the Kremlin said there was no immediate prospect of resuming formal peace negotiations, even while insisting that Russia remained open to diplomacy. Days later, Reuters reported that Ukrainian and U.S. officials had discussed a possible aerial ceasefire as one route toward reviving negotiations, although Moscow said it was too early to assess the proposal.

For Ukraine, an inadequately guaranteed ceasefire risks freezing Russian territorial gains while leaving Moscow capable of attacking again. For Russia, stopping now would mean abandoning the possibility that continued military pressure, declining Western support or political change abroad could eventually force Kyiv into greater concessions. The Kremlin has openly indicated that Russia intends to keep pursuing its objectives militarily while awaiting new diplomatic proposals.

Both sides therefore face enormous costs from continuing the war but evaluate the future differently. That is a stalemate, but not necessarily a mutually accepted dead end.

Political systems can also insulate decision-makers from some of the costs borne by society. Authoritarian governments in particular may be able to tolerate levels of economic hardship and casualties that would create stronger electoral pressure elsewhere. A war can therefore become mutually painful at the societal level without becoming politically unbearable for the leadership that would actually have to authorize concessions.

Peace Fails When Both Sides Still Expect Tomorrow to Be Better

Negotiations require governments to compare two uncertain futures: the agreement available today and the one they believe continued fighting might deliver tomorrow.

Even an expensive war can remain strategically attractive if leaders believe another six months of military pressure, sanctions or political change will improve their position.

The U.S.-Iran confrontation demonstrates the pattern particularly clearly. Washington and Tehran signed an interim ceasefire agreement in June, including arrangements intended to restore shipping through the Strait of Hormuz and create space for negotiations over a more lasting settlement. Within weeks, however, renewed hostilities were already eroding the agreement amid disputes over Hormuz, sanctions and the obligations each side believed the other had violated.

By August, Iran and Oman were nearing another agreement over shipping arrangements in the strait, but Tehran made clear that maritime arrangements alone would not end the dispute. Iran tied reopening Hormuz to broader U.S. concessions, including sanctions relief, compensation for attacks and an end to military pressure, while Washington maintained that changes to its own restrictions would depend on Iranian compliance.

Iran has reason to believe control over maritime access, regional partners and continued military pressure can increase the price Washington must pay for normalization. The United States has reason to believe sanctions, military force and economic pressure can force Tehran to accept more restrictive terms.

Each side therefore uses negotiations partly to test whether the other is becoming more vulnerable.

The bargaining table becomes another front in the conflict.

Modern Weapons Make Stalemates More Violent

Military technology has fundamentally changed what stalemate looks like.

Historically, static fronts could produce reductions in fighting because major offensives required enormous concentrations of troops, artillery and logistics. Today, strategically deadlocked opponents can continue imposing costs through drones, missiles, cyber operations, sabotage and long-range strikes without attempting decisive territorial offensives.

Cheap, attritable unmanned systems are particularly important. They allow resource-constrained states and non-state actors to lower the cost of projecting force, since a drone or loitering munition requires far less manpower and political exposure than a conventional offensive.

Ukraine and Russia can attack infrastructure hundreds of kilometres behind the front even when territorial movement is limited. Iran and its regional partners can threaten shipping and energy infrastructure without attempting territorial conquest. Israel and Hezbollah can exchange missiles, drones and air strikes while avoiding – or postponing – another full-scale ground war.

Because no individual strike necessarily requires national mobilization or a formal decision to escalate into total war, leaders can sustain prolonged campaigns of attrition while postponing the political reckoning that might otherwise push them toward settlement.

The battlefield can stabilize while violence continues.

Ceasefires Solve the Shooting Before the Conflict

Lebanon demonstrates another recurring problem: ceasefires can reduce violence without resolving the political structure that produced it.

Israel and Hezbollah agreed to a new ceasefire in June after another escalation in fighting, with U.S. and Qatari mediators involved and Iran assisting the diplomatic effort. Yet the agreement did not settle the core disputes over Israeli deployments, Hezbollah’s military infrastructure and the Lebanese state’s authority in the south.

Diplomatic efforts have continued. Lebanon and Israel have held U.S.-facilitated talks aimed at expanding Lebanese government authority in southern Lebanon, and by August they had agreed to develop a shortlist of countries that could provide forces to verify Hezbollah’s disarmament. Hezbollah itself, however, has rejected disarmament.

Ceasefires can also give combatants time to rotate exhausted units, replenish stocks and adapt defensive networks, creating fears that a pause may strengthen the opposing side before fighting resumes. Those fears can make even temporary agreements politically difficult.

This exposes the difference between conflict management and conflict settlement.

A ceasefire can establish where soldiers may deploy, which targets cannot be struck or who monitors a buffer zone. It cannot automatically answer who possesses a legitimate armed force inside Lebanon, what Israel considers adequate protection from future attacks or how Iran’s relationship with Hezbollah fits into the regional balance.

Those questions are political rather than technical.

Negotiators can therefore design increasingly sophisticated monitoring mechanisms that manage a dispute without ending it.

Outside Powers Can Prevent Defeat Without Producing Peace

External patrons frequently make wars harder to lose without making them easier to settle.

Western military and financial assistance has helped Ukraine resist a much larger Russian state. Iran’s military technology, financing and procurement networks have strengthened the Houthis and Hezbollah, while Saudi Arabia and the United Arab Emirates have supported different anti-Houthi forces in Yemen.

Preventing the collapse of an attacked country or vulnerable ally may be strategically essential. But outside assistance also changes negotiating calculations. A combatant that might otherwise conclude it cannot continue can instead believe additional weapons, financing or political backing will eventually restore its position.

Yemen offers a particularly clear example of what happens when this condition persists for years.

Saudi Arabia and the Houthis dramatically reduced direct hostilities after the 2022 truce and pursued negotiations, but the underlying conflict remained unresolved. The Houthis retained control of the populous north while developing their missile, drone and maritime capabilities.

By July 2026, Reuters reported that Yemen was again moving toward renewed war as Houthi attacks on Saudi targets resumed and opposing Yemeni forces reinforced several front lines.

Years without full-scale war had preserved a balance rather than produced peace.

Domestic Politics Makes Concessions More Expensive Than War

Leaders negotiate not only with their enemies but with their own societies, militaries, political parties, ideological movements and allies.

Territorial concessions in Ukraine are not abstract lines on a diplomatic map. They concern millions of citizens, occupied territory and a war launched by Russia in violation of Ukraine’s sovereignty.

A January 2026 poll by the Kyiv International Institute of Sociology, reported by Reuters, found that 54% of Ukrainians opposed withdrawing from Ukrainian-held parts of Donetsk even in exchange for U.S. and European security guarantees. Nearly 70% doubted that ongoing negotiations would produce lasting peace.

Hezbollah faces its own constituency and ideological legitimacy problem if it surrenders its weapons under Israeli pressure. Iranian leaders cannot easily present major concessions made under U.S. military pressure as victory. Israeli governments face domestic demands to ensure that communities near the Lebanese border are not again exposed to a rebuilt Hezbollah military presence.

The agreement acceptable to foreign diplomats may therefore carry enormous domestic political costs for the leaders expected to sign it.

War spreads its costs across societies. Political compromise often concentrates them immediately on the government making the concession. That asymmetry encourages delay.

Negotiations Are Often Working – Just Not the Way We Imagine

None of this means diplomacy is pointless.

Negotiations can exchange prisoners, establish humanitarian corridors, prevent accidental escalation, reopen shipping lanes, regulate military deployments and create temporary ceasefires. These achievements can save thousands of lives even when they fail to produce a comprehensive settlement.

The mistake is assuming that every negotiation is a failed version of a final peace treaty.

In many contemporary conflicts, diplomacy has instead become a mechanism for managing unresolved war. Parties negotiate because neither wants unlimited escalation while continuing to fight because neither accepts the political outcome currently available through compromise.

The result is the characteristic rhythm of modern conflict: escalation, mediation, temporary ceasefire, rearmament, renewed confrontation and another round of diplomacy.

A durable settlement becomes possible when the major parties conclude not only that continued fighting is costly, but that it is unlikely to deliver something meaningfully better — and when the alternative settlement provides enough security that signing it appears safer than continuing the war.

Ukraine, Iran, Lebanon and Yemen have repeatedly reached the first threshold: all sides understand that war is costly. What they have not reached is the point where peace appears safer than continued conflict. Until that calculation changes, negotiations are likely to manage wars rather than end them.