The United States has agreed to provide $800m of military assistance to Ukraine – roughly £610m of kit.
The hardware includes weapons, armoured vehicles and helicopters, which President Joe Biden says are "tailored to the wider assault we expect Russia to launch in eastern Ukraine".
Mr Biden announced the aid after a call with Ukrainian President Volodymyr Zelensky.
What’s in the package?
It includes 18 of the US Army's 155mm howitzers and 40,000 artillery rounds, two air surveillance radars, 300 Switchblade "kamikaze" armed drones, and 500 Javelin missiles designed to knock out tanks and other armour.
Also included are 10 counter-artillery radars used to track incoming artillery and other projectiles to determine their point of origin for counter-attacks.
In addition, the US is sending 11 Soviet-era Mi-17 helicopters.
The Pentagon clarified that some of the equipment will require training for Ukrainian forces not fully accustomed to US military technology.
Mr Biden said that the US will continue to work with allies to share additional weapons and resources as the conflict continues.
Video thumbnail image: US Department of Defense.