Kyiv is working with allies on security guarantees akin to NATO's mutual protection pledge, Ukraine's president Volodymr Zelensky has said. Officials from Ukraine and allies the U.S., the U.K., France and Germany met in London on Thursday in a week when a peace proposal was produced which outlined an Article 5-like agreement which would be backed by Washington.

The president’s comments came after he said Crimea “will stay with Russia,” a position backed by the mayor of Kyiv, who conceded that his country may have to give up territory.

Moscow and Washington seem close to an agreement on a Ukraine peace plan, leaving Russia pleased – even if the talks don’t pan out.

Russian security forces say they have detained a Ukrainian spy accused of killing a senior Russian general in a car bomb attack in Moscow's suburbs on Friday. The FSB secret service said they had apprehended "Ukrainian special services agent Ignat Kuzi" who had "planted explosives in a Volkswagen Golf" to kill Gen Yaroslav Moskalik.

Russia’s Federal Security Service accused the man of planting an explosive device in the car, but said that it was detonated from Ukraine.

President Donald Trump said Thursday that the U.S. is putting pressure on Russia to stop its attacks on Ukraine. "You have no idea what pressure we're putting on Russia," Trump claimed. Trump was asked about what concessions the Russian government has offered to reach a peace plan with Ukraine,