Poland scrambled fighter jets and an early warning aircraft, and put its ground air defenses and radar systems on "the highest state" of alert.

The onslaught led to power cuts in all regions of Ukraine as Russia seeks to disrupt electricity and heating supplies as winter approaches.

Two drones were spotted, and one was shot down. The incident occurred on October 17 but was only recently revealed. It comes amid demands for a more robust response to Russian incursions.

NATO forces shot down a suspicious drone hovering around US military barracks in Estonia, it has emerged. The facility – Camp Reedo – is less than 30 miles from the Russian

Russian Foreign Minister Sergei Lavrov said on Tuesday that Moscow is prepared to give NATO and EU countries a non-aggression guarantee, reiterating that Russia has no intention of attacking any of their current members.

Russia believes some NATO members, in particular Poland, want to abandon restrictions on the deployment of nuclear weapons in their countries, which would aggravate “strategic risks” and tensions, Russian foreign ministry spokeswoman Maria Zakharova said.

Russia is amassing nuclear weapons and attack submarines in the Arctic Circle as it prepares for war with Nato, Norway’s defence minister has warned.

The strikes, which were the latest in Russia’s almost daily attacks on the Ukrainian power grid as bitter winter temperatures approach, killed at least six people, including a 7-year-old girl, according to authorities. Children between 2 and 16 years of age were among the 18 injured.

Lithuania accuses Belarus and Russia of a "deliberate escalation of hybrid warfare" as balloons shut down major airport.