Russia vs Ukraine: The War at Four Years

As of April 2026, the war between Russia and Ukraine is in its fifth year. It is the largest interstate war in Europe since 1945. It has killed or wounded hundreds of thousands of soldiers on both sides, displaced millions of civilians, and permanently restructured the European security order. It is also, at present, not close to ending.

What is happening

The front line has been largely static since late 2023, with gains and losses measured in kilometers rather than hundreds of kilometers. Russia controls Crimea (annexed in 2014), most of Luhansk and Donetsk oblasts, and significant portions of Zaporizhzhia and Kherson oblasts — approximately 18% of Ukraine's internationally recognized territory. Ukraine has incorporated a small slice of Russia's Kursk region since August 2024 but is struggling to hold it.

Both sides are waging a war of attrition. Artillery, drones, and electronic warfare have replaced tanks and aircraft as the decisive weapons. Russian casualties are heavy but sustainable for a country of 143 million. Ukrainian casualties are proportionally heavier. Both economies are on war footing. Both depend on external support — Russia from Iran, North Korea, and increasingly China; Ukraine from the United States and Europe.

Why it happened

The February 2022 invasion had multiple causes that historians will argue about for decades. Russia's stated grievances focused on NATO expansion and perceived Western encroachment. Russian leadership viewed Ukraine's post-2014 Westward drift as unacceptable. The Russian military assessed that Ukraine would collapse quickly under direct pressure. These assumptions proved wrong.

The deeper pattern was a long-building conflict over Ukraine's identity and orientation that began with the 2004 Orange Revolution, escalated with the 2014 Maidan revolution and Russian annexation of Crimea, and turned into full war in 2022. For Russian leadership, the invasion was the forcible resolution of a strategic problem that had been festering for 20 years. For Ukraine, it was a war for national survival.

The failed blitzkrieg

The first phase of the war — from late February to early April 2022 — was supposed to be quick. Russian columns advanced on Kyiv from multiple directions. Airborne forces attempted to seize Hostomel airport. The expectation was that the Ukrainian government would flee and a pro-Russian administration would be installed within days.

None of this worked. Ukrainian resistance was more effective than expected. Russian logistics failed immediately — the famous 40-kilometer traffic jam north of Kyiv became a symbol of the operation's breakdown. Ukrainian ambushes using Western-supplied anti-tank weapons (Javelins, NLAWs) destroyed Russian armor by the hundreds. By late March, Russia had withdrawn from the Kyiv axis and concentrated its effort on eastern and southern Ukraine.

The Donbas grind and the counteroffensive

From spring 2022 through autumn 2023, the war settled into grinding combat in the east. Russia captured Mariupol after a brutal siege. It seized Severodonetsk and Lysychansk. Ukraine counterattacked successfully in Kharkiv oblast in September 2022 and in Kherson in November 2022, recovering significant territory.

The much-anticipated Ukrainian summer counteroffensive of 2023 failed to achieve its stated goals. Ukrainian forces, trained on Western doctrine but equipped for high-attrition warfare, could not break through Russian defensive lines that had been built up over nearly a year. Dense minefields, layered artillery, and electronic warfare made traditional combined-arms breakthroughs nearly impossible. The failure of the counteroffensive marked the start of a new strategic reality.

2024-2026: The war of attrition

Since early 2024, the war has been defined by attrition — of equipment, ammunition, and manpower. Russia has committed to a long war. Its defense industry has been reorganized for sustained production. It has acquired millions of rounds of North Korean artillery and thousands of Iranian drones. It has mobilized hundreds of thousands of additional troops, accepting high casualty rates.

Ukraine has adapted to a war it cannot win through maneuver. It has built a domestic drone industry that produces tens of thousands of small drones per month. It has struck Russian oil refineries, airfields, and logistical infrastructure deep inside Russia using long-range strike weapons. It has held the line with ingenuity and Western artillery ammunition, but at an unsustainable personnel cost.

Western support has plateaued rather than collapsed. The United States, Germany, the UK, France, and Nordic states continue to provide significant military and financial aid. The European Union has become Ukraine's largest aggregate backer. But political fatigue is real. Every year, aid packages are harder to pass. Every year, the question of 'how does this end' becomes more pointed.

The drone revolution

Ukraine is the first war where small commercial-grade drones have played a decisive battlefield role. FPV drones — first-person-view quadcopters armed with shaped charges — have killed more armored vehicles than any other weapon system. Reconnaissance drones provide real-time targeting for artillery. Long-range attack drones have struck targets hundreds of kilometers inside Russia. Both sides now produce drones by the million.

The implications for future warfare are still being worked out. Every military in the world is studying Ukraine for lessons. Tanks are not obsolete, but their survivability in contested airspace is much reduced. Electronic warfare has become as important as kinetic weapons. The cost-per-kill ratio has been transformed in favor of cheap, mass-produced systems.

Nuclear red lines

Russia has repeatedly invoked nuclear weapons in the context of the war. Nuclear red lines have been drawn, crossed, and redrawn. No actual use has occurred. The consensus among Western analysts is that Russian nuclear threats have so far been designed to deter Western escalation rather than as preparation for actual use.

But the war has raised the global salience of nuclear weapons in a way not seen since the Cold War. Belarus now hosts Russian tactical nuclear weapons. Other nations — including some in Europe and Asia — are reconsidering their own nuclear postures. The nonproliferation regime has been weakened even if no weapons have been used.

What could happen next

Scenario 1: Continued attrition (most likely)

The war continues through 2026 with modest territorial changes, heavy casualties, and sustained Western support at current levels. Neither side breaks through. Neither collapses. This is the baseline scenario — the war becomes a permanent feature of European security.

Scenario 2: Frozen conflict with armistice

International pressure and mutual exhaustion lead to an armistice along current lines. Ukraine does not formally cede territory. Russia does not formally withdraw. Both sides rebuild. The conflict becomes permanent but non-kinetic, like the Korean DMZ. This is the scenario many Western capitals would prefer but neither belligerent currently accepts.

Scenario 3: Ukrainian collapse

Western support falters, Ukrainian manpower runs out, or the front gives way at a critical point. This could precipitate a broader political crisis in Kyiv and a humiliating settlement. Unlikely in the short term, but not impossible if Western aid is significantly cut.

Scenario 4: Russian strategic setback

A black swan event — major internal crisis, successful Ukrainian deep strike campaign, Chinese withdrawal of support — could force Russia to reconsider. Russian domestic politics are opaque but real pressures exist. This scenario is also unlikely in the short term.

The bottom line

The Russia-Ukraine war is the defining security event of this decade in Europe. It has already reshaped NATO, driven a historic German defense buildup, accelerated the bifurcation of the global economy, and demonstrated that large land wars are still possible between industrial powers. It will continue to shape European security whether it ends in 2026 or continues for another five years.

The single variable that matters most is Western political will. Russia cannot be defeated militarily by Ukraine alone. Ukraine cannot be defeated militarily by Russia as long as Western support continues. The war will end when one of those conditions changes. Neither appears likely to change quickly.