Sergey Ryabkov told ABC News Moscow cannot compromise on key territories.

Kyiv has now expressed readiness to drop its bid to join the NATO military alliance if the U.S. and other Western nations give it similar security guarantees.

President Donald Trump has directed U.S. officials to help to facilitate a “lasting and durable peace" between Ukraine and Russia, with a "very, very strong" package being presented.

BERLIN, Dec 15 (Reuters) - European leaders said they had agreed on Monday any decisions on potential Ukrainian territorial concessions to Russia could only be made once robust security guarantees were in place which should include a European-led multinational force.

Two days of intense negotiations between Ukraine, the U.S. and European officials resulted in clear progress on security guarantees for Ukraine but left significant gaps on the issue of territory, U.S.

The new head of MI6 will warn Vladimir Putin today that Britain will never abandon Ukraine, as she hits out at Russia's "aggressive, expansionist, and revisionist" threat.Blaise Metreweli will use her first speech at MI6 headquarters to say: “Putin should be in no doubt,

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.

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.