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.

Trump said the United States would put secondary tariffs on countries that do business with Russia if a peace deal is not reached in 50 days.

Separately, on Thursday, bookmaker Star Sports offered odds of 7/2 (22.2 percent) on Trump securing the Nobel Peace Prize, placing him behind Navalnaya on 2/1 (33.3 percent) and ahead of Russian anti-war campaigner Alexei Gorinov on 6/1 (14.3 percent) and Ukrainian President Volodymyr Zelensky with 10/1 (9.1 percent).

Russia launched over 30 missiles and 300 drones during its overnight assault that affected 10 regions of the country, Ukrainian President Zelenskiy said.

Former Ukraine aid critics now back Trump's strategy requiring European funding for weapons to Kyiv after the president pivoted his frustration from Zelenskyy to Putin.

US President Donald Trump is trying again to end the war in Ukraine – not by targeting Russia, but by hitting the countries that buy Russia’s oil.

The Kremlin said on Friday that it did not believe that a tougher stance U.S. President Donald Trump has adopted towards Russia over its war in Ukraine means the end of U.S-Russia talks aimed at reviving their battered ties.