President Vladimir Putin's launch of an Oreshnik hypersonic missile appears aimed at intimidating Ukraine and sending a signal of Russian military might to Europe and the United States at a crucial juncture in talks to end the war.

Ukraine's commander in chief said December was the first month that its drones "neutralized" roughly as many Russians as were called up.

The Trump administration backs Ukraine security guarantees against Russia and says it hopes to acquire Greenland.

Britain said it was allocating 200 million pounds ($270 million) to fund preparations for the possible deployment of troops to Ukraine, after pledging its soldiers this week