Trump said the United States would put secondary tariffs on countries that do business with Russia if a peace deal is not reached in 50 days.

President Trump opened his remarks alongside NATO Secretary-General Mark Rutte in the Oval Office on Monday by threatening "severe tariffs" against Russia.

In response to the escalating threat, President Trump confirmed Monday that the U.S. will send additional Patriot air defense missiles to Ukraine. He noted that the European Union would finance the purchase of what he described as "various pieces of very sophisticated" U.S. weaponry.