I don't have any other information on this yet, but this is what appeared in Japan's TBS News (10:38PM 2/8/2012):
The Ministry of Defense announced that two Russian bombers flew the perimeter of Japan's airspace.
The two bombers were TU-95. From 9AM to 9PM on February 8, they flew north from off the coast of Shimane Prefecture on the Japan Sea side, past the Northern Territories (the Kurile Islands) and down to Boso Peninsula on the Pacific Ocean; they repeated the pattern a number of times.
The Air Self Defense Force responded by scrambling its fighter aircrafts in the western, central, and northern air defense forces.
That covers about 70% of Japan. It looks as if they were testing the response. Is the Cold War back on again?