The Japan Meteorological Agency said the quake struck 36 miles below the sea at 11.38pm local time.
More than 40 Russian vessels and 30-plus military planes and 20 helicopters took part in exercises in Crimea, with missile launches, practice bombings and landings by amphibious forces.
The Japanese and Singaporeans can travel to 192 countries visa-free, with those from second-place Germany and South Korea able to visit 190 countries.
A Brief History of UFOs in Japan The Diplomat
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