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

Russian Deputy Foreign Minister Sergey Ryabkov told ABC News during an exclusive interview in Moscow on Monday that he believes the warring parties are close to a deal.

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.

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.

Ukrainian drone attack in southwestern Russia killed two people as parts of Ukraine went without power after Russian assaults on energy sites hours before peace talks were to restart in Germany.

KYIV, Ukraine (AP) — A senior Kremlin official said Friday that Russian police and National Guard will stay on in eastern Ukraine’s Donbas and oversee the industry-rich region, even if a peace settlement ends Russia’s nearly four-year war in Ukraine.