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.

President Trump’s 50-day Ukraine ultimatum to Russia is likely to fail because Vladimir Putin believes he can withstand any new sanctions and is not negotiating in good faith. -Even as Russia’s economy teeters on the brink of recession,

In the days since President Donald Trump issued a 50-day ultimatum to Russian President Vladimir Putin to end the war in Ukraine, Kremlin officials have shown little interest in coming to the negotiating table.