The United States has canceled a planned summit in Budapest between President Donald Trump and Russian President Vladimir Putin after Russia stood firm on its tough demands on Ukraine, the Financial Times reported on Friday.

The decision came after a tense phone conversation between foreign ministers Rubio and Lavrov.

The tension was caused after Russia sent a preparatory note to Washington, in which it is pointed out its irrevocable position regarding the demands it has for Ukraine.

Trump said on Saturday he would not meet with Russian President Vladimir Putin until he was convinced there was a concrete peace deal to end the war between Russia and Ukraine, which will mark four years in February.

The two leaders were expected to meet in Budapest to advance negotiations on a deal, but the summit never took place.

“I need to know that we will come to an agreement. I’m not going to waste my time,” Trump told reporters on Air Force One during his flight to Asia. He added that although he had “always had excellent relations” with Putin, Russia’s latest stance was “very disappointing”.

Trump and Putin last met on Aug. 15 in Alaska, in a series of talks that both sides described as encouraging efforts to end Moscow’s war in Ukraine.

However, the conflict shows no signs of slowing down. Overnight, Russian missile and drone attacks in Ukraine killed at least four people and injured 20, underscoring the grim reality.

Trump is hardening his stance on Russia

US President Donald Trump will go ahead with tough new sanctions on Russia’s oil sector, with the aim of putting pressure on Vladimir Putin to negotiate an end to the war in Ukraine, US Ambassador to NATO Matthew Whittaker said yesterday.

“We have implemented these sanctions and we intend to enforce them strongly,” Whittaker said in an interview with Bloomberg TV on Tuesday.

Last week, the US Treasury Department blacklisted state oil companies Rosneft PJSC and Lukoil PJSC, Russia’s two biggest oil producers as part of a new effort to deprive the Kremlin of revenue that funds the war.

It is the first major package of economic sanctions against Russia since Trump took office.

“Maybe this will be the step that will bring President Putin to the negotiating table and an end to the war, or at least to a truce that will pave the way for a final solution,” Whittaker added.