They are in high demand, short supply and considered one of the most advanced US air-defence systems.
But despite allies around the world vying to get their hands on the long-range Patriot missile-defence systems, the Biden administration has finally agreed to send one to Ukraine.
"Over the past three hundred days, the Kremlin has tried and failed to wipe Ukraine off the map," said US Secretary of State Antony Blinken in a statement announcing the US$1.85 billion ($2.75 billion) aid package.
