Kyiv, Ukraine - Ukraine will no longer abide by US President Donald Trump's demands not to strike Russian oil refineries, President Volodymyr Zelensky said in remarks published Thursday, as tensions deepened between the two leaders over a US-Russia diesel agreement.

Relations between Kyiv and Washington have soured since last week, when Trump eased sanctions on Russia in exchange for Moscow releasing large amounts of diesel onto global markets.

Zelensky described the deal as a "weak decision", saying it would encourage Russia to prolong its four-and-a-half-year war with Ukraine, while several of Ukraine's European allies criticised the agreement.

Addressing the criticism on Saturday, Trump claimed Ukrainian attacks on Russian oil refineries were to blame for rising diesel prices and said it was "time for Ukraine to get a new president".

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"The block [on attacking refineries] is out," Zelensky told the Financial Times in an interview published on Thursday. "We're done."

Trump had announced on Sunday a surprise "energy ceasefire" between Russia and Ukraine, which Zelensky said he knew nothing about.

And earlier this week, Ukraine reported disruptions to a critical US satellite communications system that its army uses on the battlefield.

"We need HONESTY from our partners about this war," Zelensky wrote on social media on Thursday.

In an interview with British journalist Piers Morgan on Wednesday, Zelensky agreed that he felt "betrayed" by Trump's diesel-supply deal with Russia's Vladimir Putin.

He also questioned the advice that Trump was receiving, after senior Ukrainian officials in Kyiv openly accused the United States of helping Russia.

"It's painful when President Trump chooses one side, not our side," he said. "I think his advisors are wrong. This is not [the] right side of history."

Since launching a full-scale invasion of its neighbor in 2022, Russia has systematically hit Ukrainian energy infrastructure, leading to energy and heating shortages – while Ukraine has hit back at Russian oil refineries it says fund the war.

More recently, Trump's war in Iran has led to oil shortages and ensuing price spikes, creating major headwinds for his Republican Party ahead of midterm elections early next month.