There have been several similar incidents this year
US reconnaissance aircraft was intercepted by a Russian jet flying above the Black Sea. The Russian SU-27 approached the American plane as close as 10 feet.
Pentagon already called such a manoeuvre "dangerous and unprofessional".
Earlier the US Defence Ministry accused Russia of an attempt to reshape the world order.
Defence Secretary Ash Carter said that Russia already violated the territorial integrity of Ukraine and Georgia and now continues to rattle its sabre. Carter reassured - the United States are not looking for enemies, but will protect their allies.