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.

Russian foreign minister Sergei Lavrov described discussions about future security guarantees for Ukraine as a "road to nowhere". Now, he says they're "hopeless".

NATO Chiefs of Defense reaffirmed support for Ukraine in a virtual meeting led by Gen. Alexus Grynkewich, joined by Gen. Dan Caine and all 32 allied leaders.

The incident highlights the continuing volatility near NATO's eastern border as Russia intensifies aerial attacks on Ukraine.

T wo German fighter jets were scrambled to the Romanian-Ukrainian border on Tuesday night in response to a Russian drone attack in the frontier region, Romania's Defense Ministry said in a statement.