WASHINGTON, Dec. 14 (Aljazeera) – The United States is finalising plans to send its sophisticated Patriot air defence system to Ukraine following an urgent request from Kyiv, which wants more robust weapons to shoot down Russian missiles and drones that have devastated the country’s energy infrastructure and left millions without heating in the bitter cold of winter.

Washington could announce a decision on the Patriot as soon as Thursday, the Reuters and Associated Press news agencies reported on Tuesday, citing US government officials.

Ukrainian President Volodymyr Zelenskyy pressed Western leaders as recently as Monday to provide more advanced weapons to his country. The Patriot would be the most advanced surface-to-air missile system the West has provided to Ukraine.

Gaining Patriot air defence capability would be “very, very significant” for Kyiv, said Alexander Vindman, a retired Army lieutenant colonel and onetime leader of Ukraine policy at the White House.

“These are going to be quite capable of dealing with a lot of different challenges the Ukrainians have, especially if the Russians bring in short-range ballistic missiles.”

The Pentagon declined to comment and there was no immediate comment from Ukrainian officials.

Former Russian President Dmitry Medvedev has warned NATO against equipping Kyiv with Patriot missile defences, and it is likely the Kremlin will view the move as an escalation.

Russia invaded Ukraine on February 24 and is now embroiled in a grinding war in the industrialised Donbas region in Ukraine’s east.