RIA Novosti 
April 11, 2012
Two Russian anti-submarine aircraft have flown over a Japanese destroyer preparing to shoot down a North Korean rocket if it passes over Japan’s territory, a Japanese TV channel reported on Wednesday, citing the country’s Defense Ministry.
According to the ministry, the Il-38 planes were seen on Tuesday off the south-west coast of the largest Japanese island of Honshu, where the destroyer is currently based. The ministry said that Japanese fighters accompanied the IL-38s during their flight.
The NHK TV channel suggested that the Russian planes had been collecting information on the multi-purpose combat system Aegis which is installed on the destroyer.
Russian patrol aircrafts have been spotted performing reconnaissance missions, without violating borders, off the coast of Japan since the end of March, NHK reported.