Special U.S. envoy Steve Witkoff says Russian leader Vladimir Putin agreed to allow the U.S. and Europe to offer Ukraine a security guarantee resembling NATO's collective defense mandate.

The NATO Chiefs of Defense reaffirmed support for Ukraine in a virtual meeting Wednesday in Brussels that included all 32 allied military leaders and featured the first briefing in this format led

On Tuesday, U.K. Prime Minister Keir Starmer hailed the possibility of NATO-backed security guarantees as a “breakthrough,” noting that the U.S. was now working “at pace” with 30 or so other countries, which he called a “coalition of the willing,” to help Ukraine.

European NATO leaders must not be naive when discussing a Ukraine peace force but face up to the reality that they would need to deploy tens of thousands of troops to the country for the long term, the head of Germany's soldiers' union said.

Secretary of State Marco Rubio told European counterparts Thursday the US will participate in post-war security guarantees for Ukraine but that the Trump administration believes Europe should take the lead,

It’s not often that you have eight European leaders, including one whose country is at war, descend on Washington in as close to an unplanned snap visit as you can get. Let’s hope that the

NATO aircraft scrambled from Romania following a large-scale Russian attack on across Ukraine overnight, including in the Odesa region near Danube River border with allied nation.

President Trump hosted Ukrainian President Volodymyr Zelenskyy and European leaders at the White House on Monday, an event the U.S. president called "a very good, early step" to possibly resolve the war in Ukraine.

General Christopher Donahue, commander of U.S. Army Europe and Africa, said allies could seize Kaliningrad "in a timeframe that is unheard of."

Trump asserts Ukraine should remain outside NATO, citing concerns over its democratic status and the implications for U.S. national security.

NATO allies and Ukraine are working together to make sure security guarantees for Ukraine are at such a robust level that Russia will never try to attack again, NATO chief Mark Rutte said on Friday, adding that Europe and the United States would be involved in providing them.

Many of the drones aren’t particularly fast or high-tech, but they are cheap enough for the Kremlin to launch more than 700 in one night, in an effort to overwhelm Ukraine’s air defenses. Here’s what we know.