The Patriot surface-to-air missile system has become one of Ukraine's most important platforms during Russia's full-scale invasion, which began in February 2022. Since 2023, Patriots in Ukraine have been used to down drones, ballistic missiles and Russian aircraft.

Trump's threat against Russia runs parallel to a Senate-led effort to pass crippling sanctions on countries that buy Russian energy.

Trump announced the pact with Indonesia, a relatively minor U.S. trading partner, as he continued to press for what he views as better terms with trading partners and ways to shrink a huge U.S. trade deficit.

President Donald Trump opened his remarks alongside NATO Secretary-General Mark Rutte in the Oval Office on Monday by threatening "severe tariffs" against Russia. "We're very, very unhappy with them," Trump said of Russia. "And we're going to be doing very severe tariffs if we don't have a deal in 50 days."