Earlier this month, Trump set a 50-day deadline for Moscow to agree to a ceasefire, threatening fresh sanctions and tariffs if it failed to do so. Trump also announced new military support for Kyiv, with a particular focus on strengthening Ukraine's anti-drone and anti-missile defenses.

U.S. President Donald Trump's decision to ramp up arms shipments to Ukraine is a signal to Kyiv to abandon peace efforts, Russia said on Thursday, vowing it would not accept the "blackmail" of Washington's new sanctions ultimatum.