NATO Secretary-General Mark Rutte has warned that a Russian victory over Ukraine would undermine the dissuasive force of the world’s biggest military alliance and could cost trillions of dollars to restore the organization's credibility.

NATO Secretary General Mark Rutte reaffirmed on Thursday the need to step up support for Ukraine, adding it was vital Russia did not win as it could result in Russian President Vladimir Putin 'high fiving' the leaders of North Korea and China.

Trump did not mention Ukraine in his inauguration speech but has told reporters that Vladimir Putin would be destroying Russia by not agreeing to a peace deal.

Lithuania seems to be sending a message that it will continue its support for Ukraine whether the U.S. continues to do so or not.

Transatlantic military alliance chief echoes Ukrainian leader Volodymyr Zelenskyy in stinging remarks at the World Economic Forum.

Donald Trump pledged to end the conflict in Ukraine, but the war has proved harder to solve than he once thought. Now, he says he'll sanction Russia.

The U.K., France and other allies have discussed the possibility of deploying peacekeeping troops to Ukraine as the war escalates.

Andrzej Duda is the president of Poland, an increasingly important economic and geopolitical force in Europe. On Tuesday, Jan. 21, Duda joins Washington Post columnist David Ignatius to discuss the war in Ukraine,

To bring Russia to the negotiating table and end the war in Ukraine, Vladimir Putin needs to believe time is no longer on his side. Here's what the Trump administration needs to do to make that

NATO has taken over air defenses in Poland from the US just days before the inauguration of President-elect Donald Trump, according to a NATO spokesman, with questions looming about the incoming administration’s approach to the alliance and to Ukraine.

President Donald Trump has missed his deadline for ending the war in Ukraine . Of course, no one truly believed Trump would be able end the grinding, three-year conflict in 24 hours, as he implausibly promised repeatedly as a candidate. Even his new special envoy to Ukraine has asked for 100 days to find a solution.

Solovyov began by bringing out a large military plaque from Ukraine's largely Russia-occupied Donetsk region, where fierce fighting is ongoing. He issued a warning to NATO member states Germany ...