"I'm not in a position to put a cap on it at this point in time," Psaki said during a press briefing on Monday.
The United States has provided more than $5 billion to Ukraine in the form of military, humanitarian, and economic assistance since Russia launched its special military operation in the neighboring country.
Psaki noted that Biden will consult with US lawmakers and military leaders about Washington's future assistance for Ukraine.
On Sunday, Secretary of State Antony Blinken and Defense Secretary Lloyd Austin announced that the United States will provide $713 million in foreign military aid to Ukraine and over a dozen of other countries will purchase new weapons to compensate for the arms they provided to Ukraine. Some $322 million in military assistance will be allocated to Ukraine from this package.
Blinken said US support for Ukraine going forward will continue until they see a final success in the fight against Russia.
On Thursday, Biden announced that the United States is providing Ukraine with another $800 million security aid package. The Defense Department said the new US security aid package would include 72 Howitzers, 144,000 of artillery rounds, more than 121 Phoenix tactical drones as well as parts and other equipment.