President Joe Biden on Thursday announced an additional $800 million in military aid to help Ukraine fight against the Russian invasion, but he also warned that the Congress will need to approve even more assistance if the U.S. is to keep up its crucial support, AP reported.

The new military package builds on roughly $2.6 billion in military assistance that Biden had previously approved.

The new U.S. military assistance is expected to include 72 155mm howitzers, 144,000 artillery rounds, 72 vehicles used to tow to the howitzers onto battlefields, and over 121 Phoenix Ghost tactical drones, as well as field equipment and spare parts.

The 72 howitzers are in addition to the 18 announced last week the U.S. was transferring to Ukraine.