Ukraine, which has been at war since the invasion by Russian forces two years ago, is protected by Patriot and other air defence systems from NATO countries against regular missile and drone attacks by Moscow.

The US government is preparing to halt all orders for Patriot air defence systems until Ukraine receives enough to protect itself against Russian air strikes.

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US President Joe Biden recently said that five countries have agreed to send Patriot and other air defence systems to Ukraine.

"EVERYTHING PRODUCED WILL GO TO KIEV"

Other countries waiting for the delivery of air defence systems from the US will have to wait. Because according to Biden's statement, "everything produced" will be sent to Kiev until the needs in Ukraine are met.

According to the Financial Times, two officials with knowledge of the decision said that the US announcement underlined Biden's commitment to Kiev.

THE SYSTEM THAT ALL OF EUROPE WANTS

Poland, Romania, Spain and Germany are among the European countries with orders for Patriot systems for delivery.

A coalition of NATO countries also ordered a thousand Patriot missiles in January.

Spain, Greece and Romania have Patriot missiles in their arsenals, but so far have not authorised their transfer to Ukraine.

WHAT IS THE PATRIOT AIR DEFENCE SYSTEM?

The US-made Patriot systems are Washington's most advanced air defence weapons. They consist of a radar system and a mobile launcher capable of firing interceptor missiles at incoming projectiles or aircraft.

Zelenski calls these systems "the most effective air defence system in the world today".

Ukraine currently has at least four Patriot systems provided by the United States and Germany. Patriot systems and interceptor missiles have helped protect key government buildings and critical infrastructure in Kiev and other cities across the country since the start of the war.

Editor: David Goodman