Ukraine’s General Staff claimed a strike on Rosneft PJSC’s refinery in Ryazan, one of the largest in Russia, while Moscow continued to target Ukraine’s energy system with missiles and drones ahead of winter.

Moscow’s attacks on gas supplies, the main source of warmth for most Ukrainian households, could plunge millions into the cold.

Russian President Vladimir Putin “has put us on notice that we need to quickly build those steps of the ladder of the defense of our outer perimeter,” Poland's foreign minister said.

The wall is intended to protect cities and key infrastructure from Russian glide bombs and Shahed-type drones.

Ukraine has started mass production of its new domestically developed interceptor drones to strengthen air defences, the Ukrainian defence ministry said on Friday.