In a war dominated by the unexpected, few imagined Ukraine’s fourth year at war would so firmly now question the security of all of Europe.

With the fighting in Ukraine reaching its third year on Monday, Lesley Marin takes a look back at some of the war's key moments.

Through three years of wartime leadership, Ukraine’s president has mostly played weak hands wisely. But his approach has fallen flat with the Trump administration.

The U.S. and Ukraine pushed divergent messages over the weekend, with Kyiv pressing for better terms to the mineral-rights deal sought by President Trump, while Washington urged Ukraine to swiftly accept the proposal already on the table.