“President Trump threatened new economic penalties on Russia and said he was angered by Russian President Vladimir Putin’s recent comments, escalating his rhetoric as talks have resulted in little progress toward a real cease-fire in Ukraine.

On Friday, Putin called for “interim governance” in Ukraine under the auspices of the United Nations, which would essentially push out Ukrainian President Volodymyr Zelensky.

On Sunday, Trump told NBC News those comments were unacceptable because they meant there wouldn’t be a deal for a long time. “You could say that I was very angry, pissed off,” he said, when “Putin started getting into Zelensky’s credibility.” He added that if Russia couldn’t reach a deal, he would impose secondary tariffs.

If a deal isn’t made, and if I think it was Russia’s fault,” Trump said, “anybody buying oil from Russia will not be able to sell their product, any product, not just oil, into the United States.”

WSJ

This appears to be an empty threat from Trump as USA cannot afford to block all trade with China and India - Russias two main oil export markets.