The United States secretly shipped long-range missiles to Ukraine recently, a new report claims, after recent opposisiton from the Pentagon to send such missiles to the war-torn region. 

The missiles were part of a $300 million aid package U.S. President Joe Biden approved on March 12, an unnamed source claims, according to Reuters. The funding came from refunded credits to the Pentagon for recent purchases.

The Biden administration has long backed military aid to Ukraine since Russia's full-scale invasion began in 2022.  

Some of the missiles were reportedly used in an April 17 attack on a Russian airfield in Crimea.

They were also used in a second attack.

It was not known how many of the missiles were sent.

The Pentagon had opposed sending Ukraine the long-range missiles over fears they would be used for an attack deep inside Russia.

The deployment came after Russia continued to attack critical infrastructure in Ukraine, the official told Reuters.

"We warned Russia about those things," the official said. "They renewed their targeting."

President Biden signed a bill on Wednesday morning that will send billions of crucial aid to Ukraine for its fight against Russia.

The U.S. Senate passed the $61 billion military aid package on Tuesday after the House passed it over the weekend.