President Biden unveiled a new round of military assistance for Ukraine during a meeting with Ukrainian President Volodymyr Zelensky at the G7 Summit in Japan.
Announcing the $375m aid package, which includes ammunition, artillery and armoured vehicles, Joe Biden said that the US was doing everything possible to bolster Ukraine's efforts to fight back against Russia's invasion.
"The United States continues to help Ukraine respond, recover, and rebuild," Mr Biden said.
"And we're also supporting your pursuit of a just peace, just one aspect of Ukraine's sovereignty and territorial integrity.
"It has to be non-negotiable. It just has to happen."
The State Department noted that Sunday's announcement, which comes just days after the US said it would allow the supply of F-16 fighter jets, will be the 38th drawdown of equipment for Ukraine from funding authorised by Congress since Russia first invaded Ukraine more than a year ago.
In a statement, Secretary of State Antony Blinken said: "Russia could end its war today.
"Until Russia does, the United States and our allies and partners will stand united with Ukraine, for as long as it takes."
The State Department said the package would include:
- Additional ammunition for High Mobility Artillery Rocket Systems (Himars)
- 155mm and 105mm artillery rounds
- Tube-Launched, Optically-Tracked, Wire-Guided (TOW) missiles
- Javelin and AT-4 anti-armor systems
- Laser-guided rocket system munitions
- Demolition munitions
- Armored bridging systems
- Armored medical treatment vehicles
- Trucks and trailers to transport heavy equipment
- Logistics support equipment
- Thermal imagery systems
- Spare parts and other field equipment