(Reuters) -Ukrainian President Volodymyr Zelenskiy on Friday appointed a new commander responsible for drone air defences, seen as a critical element in defending against the threat of Russian drones.

Ukraine has received more American-made Patriot air defense systems to counter Russia's attacks, according to President Volodymyr Zelenskyy

Ukraine is working with its international partners to strengthen air defense for its energy facilities. — Ukrinform.

Kyiv’s long-range drone attacks have frequently targeted Russian oil refineries in an attempt to curb Moscow’s wartime revenue. In contrast, Ukrainian and Western officials accuse Russia of deliberately crippling Ukraine’s power grid to deprive civilians of electricity, heating, and water — a strategy they describe as the weaponisation of winter.

Russia has carried out a massive aerial attack across central and eastern Ukraine, killing at least four and injuring 26 others, according to Ukrainian authorities.

Amid escalating Russian aerial attacks, Ukraine has got two more US-made Patriot air defence systems from Germany. Patriots are the most effective weapon against Russian missiles.

Putin is massing air defences around Moscow for a long winter of drone attacks. That means leaving other areas undefended, but he may have little choice in the matter.

Ukraine has received more American-made Patriot air defense systems to counter Russia's attacks, according to President Volodymyr Zelenskyy.