Tit-for-tat moves this week included the use of American-made ballistic missiles to strike inside Russia, and new nuclear threats from Moscow. Neither appear to have influenced the war on the ground.

In a stark warning to the West, President Putin said the attack with the intermediate-range Oreshnik missile was in retaliation for Kyiv’s use of U.S. and British longer-range missiles.

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?