Ukraine has lost over 40% of the territory in Russia's Kursk region that it rapidly seized in a surprise incursion in August as Russian forces have mounted waves of counter-assaults, a senior Ukrainian military source said.

Sen. Mike Rounds also expressed frustration that the United States hadn’t given Ukraine more weapons to win the war.

While the incoming Trump administration appears determined to end U.S. support for Ukraine, other western allies — including Canada — say they're not ready to give in. But can they fill the vacuum if America decides to cut and run?