U.S. President Donald Trump said on Tuesday that the United States would start imposing tariffs and other measures on Russia "10 days from today" if Moscow showed no progress toward ending the Ukraine crisis.

Trump first announced on Monday that he was shortening the initial 50-day deadline he had set a month earlier for action from Moscow, mentioning a new deadline of 10 to 12 days. On Tuesday, he told reporters he had not yet received a response from Russia.

Speaking aboard Air Force One, Trump said he was not worried about the potential impact of Russian sanctions on the oil market or prices, vowing to boost domestic oil production to offset any impact.

"I don't know if it's going to affect Russia, because (Russian President Vladimir Putin) wants to, obviously, probably keep the war going," Trump said. "But we're going to put on tariffs and the various things that you put on."

The U.S. president, who is also struggling to achieve a peace deal in Gaza, has grown increasingly frustrated with Moscow's refusal to agree to a ceasefire. Before returning to the White House in January, Trump campaigned on a promise to end Russia's conflict with Ukraine in a day. The fresh deadline suggests Trump is prepared to move forward on his threat of sanctions, after previously hesitating on doing so.

In a post on X, former Russian President Dmitry Medvedev, a close ally of Putin, said Trump was playing "a game of ultimatums" that could lead to a war involving the United States.

Medvedev wrote: "Each new ultimatum is a threat and a step towards war. Not between Russia and Ukraine, but with (Trump's) own country."

(With input from Reuters)