How Russia's gradual gains in the face of fierce Ukrainian opposition have affected the front line in recent months.

This interactive timeline of the war in Ukraine shows major attacks, key moments and how the battle lines have shifted in the four years since Russia's all-out invasion.

On the war’s fourth anniversary, Russia occupies 20 percent of Ukraine’s territory, but the front line shifts slowly.

Fighting continues near the border in the Sumy region. Ukrainian Defense Forces are repelling Russian attacks, but the situation remains difficult. Russia is making slight advances, while Ukrainian ...