According to Interfax, the Russian Department of Defense announced that four Tupolev Tu-95 strategic bombers flew the sky of the Pacific and the Arctic Ocean on 12th. Then 10fighters took off from Norway and Japan,Korea and chased Tu-95s.
The flight of those bombers was performed on high seas for about 15 hours in total while taking refueling in the air. And Russia insisted that they did not do the encroachment of air space to other countries.
However, Russia is a habitual offender of the invasion to the Japanese air space. A Russian Tu-95 invaded Japanese southeast air space two years ago. Japan took off from 22 F-15s and two E-767 and was cautious.
Russia Air Force airplanes came close to Japan three times this year.