The announcement marks the second Presidential Drawdown Authority (PDA) package since President Joe Biden signed a long-delayed national security supplemental securing $60 billion in funding for Ukraine.

Last month, just moments after Biden signed the legislation, the US announced a $1 billion PDA package to Ukraine. Biden said at the time that shipments of the equipment to Ukraine would begin “in the next few hours.” And just two days later, Defense Secretary Lloyd Austin announced a historic $6 billion long-term investment package to purchase new equipment for Ukraine.

The $6 billion package — the largest the US has announced — is under the Ukraine Security Assistance Initiative (USAI). USAI is different from than the PDA package in that it contracts with the US defense industry to purchase new equipment, whereas PDAs pull equipment from existing US stocks.