MOSCOW/KYIV - Russia on Tuesday rejected US President Donald Trump's 50-day ultimatum to agree to an Ukraine ceasefire, dismissing the threat of "severe tariffs" as unacceptable. Russian Deputy Foreign Minister Sergey Ryabkov emphasized that Moscow favors a diplomatic resolution to the Ukraine conflict and is ready to negotiate.

U.S. President Donald Trump has stood by his 50-day ultimatum to Vladimir Putin to bring an end to the Russia-Ukraine conflict. He warned that if a resolution isn't reached within that timeframe, Russia could face 100% tariffs.

Russian President Vladimir Putin has sacrificed an estimated 1 million of his soldiers, killed and wounded, in a three-year campaign to crush Ukraine.

Donald Trump’s remarks on Ukraine on Monday were far from the biggest announcement the US president could have made.

North Korean leader Kim Jong Un told Russia's top diplomat his country was ready to "unconditionally support" Moscow's every effort to resolve the conflict in Ukraine, state media reported on Sunday,

That’s what Rae said in response to a question about the impact of Russian aggression on achieving the global development goals. “The invasion of Ukraine from the very beginning triggered an immediate international food crisis,

Matthew Whitaker, U.S. Ambassador to NATO, joins CNBC's 'Squawk Box' to discuss the push for Russian sanctions, what to expect from today's meeting between President Trump and NATO Secretary-General Mark Rutte,

In the north a 50,000-strong Russian force is attacking Sumy, a provincial capital. Our model is detecting artillery fire and explosions along the city’s northern defensive lines. Ukraine is badly outnumbered but officials say the front is holding.

Latest news and live updates as Trump announces the U.S. will send Patriot missiles to Ukraine and meets with NATO's secretary general.