US President Donald Trump has warned that he will impose secondary Reuters reported.

Talking to NBC News In a Sunday morning interview, Trump said he was “cursed” on Russian President Vladimir Putin, expressing frustration over a lack of progress towards a ceasefire.

Trump’s remarks followed Putin’s recent criticism of Ukrainian President Volodymy Zelenskiy, as the US president took as a personal violation of his peace efforts.

“If Russia and I are unable to make an appointment to stop the blood edition in Ukraine, and if I think it was Russia’s fault … I will put secondary tariffs on oil on all oil coming out of Russia,” Trump said.

He clarified that such measures would mean “If you buy oil from Russia, you cannot do business in the US,” added, “there will be a 25% duty on all oil, a 25- to 50-point duty on all oil.” Trump indicated that these tariffs could be implemented within a month.

There was no immediate reaction from Moscow, although Russia has repeatedly rejected Western sanctions as “illegal” and aimed at financial benefit.

Trump, who spent the weekend in Florida, revealed he was planning to talk to Putin later this week. The Kremlin has recognized two publicly known calls between the leaders in recent months, but suggested that there may have been further discussions. The White House has not confirmed when the call will take place or whether Trump will also talk to Zelenskiy.

Trump has prioritized ending what he calls a “ridiculous” war but progress remains slow. Putin recently suggested that Ukraine could be placed under a temporary administration to facilitate new choices – an idea that Trump has previously supported.

Trump insisted that Putin understands his frustration but added, “I have a very good relationship with him” and that his anger “spreads quickly … if he is doing the right thing.”

His threats come in the midst of increased trade pressure, including recently imposed secondary tariffs on Venezuelan oil buyers and planned tasks on imports from countries with large trade surplus. The move in particular can affect India and China, both major importers of Russian oil.

Trump also suggested he could impose similar sanctions on buyers of Iranian oil, unless Tehran agrees to stop his nuclear weapons program.