Russia has rejected President Trump's "ultimatum" for Moscow to sign a ceasefire deal to end the war in Ukraine within 50 days on Tuesday as "unacceptable," calling for continued negotiations and insisting that the invasion ordered by President Vladimir Putin would continue until its goals are achieved.

US President Donald Trump on Tuesday (local time) said he wants to bring an end to the Russia-Ukraine war, declaring that he is "on the side of humanity," calling for an immediate halt to the ongoing "killing of thousands of people.