Donald Trump pledged to end the conflict in Ukraine, but the war has proved harder to solve than he once thought. Now, he says he'll sanction Russia.

U.S. President Donald Trump said on Wednesday he would add new tariffs to his sanctions threat against Russia if the country does not make a deal to end its war in Ukraine, and added that these could also be applied to "other participating countries.

President Trump has demanded Russia stop its “ridiculous war” with Ukraine or face stiffer penalties — but the U.S. doesn’t appear to have much financial leverage left after a raft of prior sanctions.