Two U.S. officials who spoke on the condition of anonymity said the arrangement would be similar to the NATO mutual defense agreement. But crucial details remain unsettled as negotiators seek a deal that Russia will approve.

The United States, Ukraine and major European countries have reached consensus on 90 percent of terms for a deal to end Ukraine’s war with Russia, two senior U.S. officials said Monday, but

Russia has indicated it's open to Ukraine joining European Union as part of peace deal to end war, US officials say

Ukraine could receive security guarantees modeled on NATO’s Article 5 mutual defense pledge under a proposed peace deal with Russia, U.S. officials said on Monday — an unprecedented offer aimed at ending the war sparked by Moscow’s 2022 invasion.

Ukraine has relinquished its ambition of joining the NATO military alliance in exchange for Western security guarantees as a compromise to end the war with Russia, President Volodymyr Zelenskyy said ahead of talks with U.S. envoys in Berlin.

The new chief of Britain’s foreign intelligence service MI6 accused Russian President Vladimir Putin of deliberately prolonging negotiations to put an end to the war in Ukraine, in an assessment that complicates Trump’s efforts to broker a deal by year-end.

Ukrainian President Volodymyr Zelenskiy resumed talks with U.S. President Donald Trump's envoys in Berlin on Monday, after the U.S. side said a lot of progress had been made on ending Europe's deadliest conflict since World War Two.

Much of Ukraine’s largest Black Sea port was without power, heat and water on Saturday after strikes from Russia, which has shown little appetite for a deal to end the war.