STORY: Addressing Americans from the White House's Roosevelt Room, Biden pledged to send dozens of howitzers, 144,000 rounds of ammunition and tactical drones, as he called on Congress for supplemental funding to provide additional aid for Kyiv.

"We’re in a critical window now of time where they’re going to set the stage for the next phase of this war,” Biden said. The United States and allies are “moving as fast as possible” to provide Ukraine with the equipment and weapons it needs.

The president also announced plans to ban Russian-affiliated ships from U.S. borders, as previously reported by Reuters, further ratcheting up pressure on Moscow.

The new arms package is the same size as an $800 million one announced last week but details are still being worked out, a U.S. official, speaking on condition of anonymity, told Reuters earlier.