NATO Secretary-General Mark Rutte issued a stark warning to Western allies about the reality of the threat posed by Russia, as negotiations are making slow progress to end the war in Ukraine and the U.S. pressures Kyiv to make painful compromises with the Kremlin, including on territorial concessions.

Poland detained a Russian archaeologist who works on an ancient site in Crimea, which Russia seized in 2014. Ukraine calls the work illegal.

Russia launched a huge attack on Ukraine overnight as the country marked Armed Forces Day on Saturday, Ukraine's air force said.

Ukrainian President Volodymyr Zelensky will meet with European leaders in London today after talks between US and Ukrainian negotiators came to a halt with no breakthrough. Follow for live updates

The issue is that “nobody believes” giving Russia Ukrainian territory is a “true alternative” to create lasting peace, Bosak says.

The U.S. has been pursuing a solution to the war in Ukraine, and recently highlighted those efforts as part of its new national security strategy. Heather Conley, former deputy assistant secretary of state for European affairs during the George W.

Ukraine attacked Lukoil PJSC’s Filanovsky oil field in the Caspian Sea, according to a person familiar the matter, widening the scope of its strikes on Russian energy infrastructure just as President Volodymyr Zelenskiy is under US pressure to agree to a peace deal largely on the Kremlin’s terms.

As Ukraine's allies co-ordinate their stance against Russian aggression, NATO's chief has warned they must prepare for a war on a scale seen by previous generations. Follow the latest.