NATO has scrambled war planes in Romania and Poland after Putin flew a military drone over Romanian territory amid Russia's latest aggression.
Posing a direct threat to the West on Sunday, Putin released the military drone but Ukraine retaliated with a massive strike on Russia, dramatically exploding a major defence-linked chemicals plant more than 1,000 miles from the frontline and triggering fires at two major oil refineries.
Sirens sounded and an air raid threat was declared as Warsaw announced Polish and allied fighter jets were operating due to Russian drones buzzing border regions of Ukraine.
This followed last week's major incursion of Polish airspace by dozens of Russian drones.
Two F-16 fighter aircraft from Romania's 86th Air Base in Fetești as Russia attacked Ukrainian ports on the River Danube.
