UK Defence Secretary John Healey has warned Vladimir Putin is 'testing' the West after Russian drones violated Polish airspace on Tuesday night, forcing a multinational response.
More than eight million Poles were ordered to hide in their homes as the drones flew overhead, with debris from one shot-down device severely damaging a house.
Poland's prime minister, Donald Tusk, condemned the unprecedented violation of the country's airspace, saying: 'This situation brings us all closer to open conflict, closer than at any time since the Second World War.'
Poland invoked NATO's Article 4, under which any member can call urgent talks when it feels its 'territorial integrity, political independence or security' are at risk.
Mark Rutte, Secretary General of the military alliance, issued a stark warning to the Russian president, telling him to 'stop violating allied airspace, and know that we stand ready, that we are vigilant, and that we will defend every inch of NATO territory'.
