The Kremlin said on Monday that any U.S. decision to allow Ukraine to fire American missiles deep into Russia would mean it was directly involved in the conflict, and would lead to consequences.

Ukraine marked 1,000 days on Tuesday since Russia's full-scale invasion, with weary troops battling on numerous fronts, Kyiv besieged by frequent drone and missile strikes, and officials preparing for Donald Trump to reclaim the White House in January.

As this brutal war of attrition grinds toward its 1,000th day, neither side seems eager to negotiate. President-elect Donald Trump has said he could quickly end the war, though it is unclear how or in