The Washington Post reported that the Trump administration has not confirmed the transfer of Patriot interceptor missiles to Ukraine, which are necessary to counter Russian missile and drone attacks. The delay coincides with a rise in tensions between Trump and Volodymyr Zelensky.

According to the newspaper, at least some of these missiles belong to countries supporting Ukraine, but because they are made in the United States, their transfer requires approval by Pete Hegseth, the U.S. defense secretary. Officials said Hegseth has not officially rejected the missile transfer, but has also not completed the necessary steps to approve it.

A Ukrainian official told The Washington Post that only “a few” Patriot interceptor missiles remain in Ukraine’s stockpiles. The U.S.-led war against the Islamic Republic has also put significant pressure on global supplies of these missiles.

The Washington Post wrote that, at the same time, Ukraine’s early warning systems—relying on U.S. information—have been facing disruptions. U.S. Secretary of State Marco Rubio said information-sharing with Ukraine has not been halted, and that the recent disruption was caused by a “software issue.”