On January 25, 2016 The Pentagon said during a routine flight over the black sea, a U.S. RC-135U Combat recon plane was intercepted by a Russian fighter jet 40 miles from the Russian coast. The U.S. flight was over international waters but Russia is known to intercept flights they believe are flying too close to its coast. This isn’t the firs time this has happened.
In 2014 a Russian Su-27 flew within 100 feet of the nose of the U.S. Air Force RC-135U over the Sea of Okhotsk between Russia and Japan, a Defense Department official said.
At the time, the U.S. official called it “one of the most dangerous close passes in decades” and said the Russian jet “put the lives of the U.S. crew in jeopardy.”
The Russian aircraft turned and “showed its belly” to the U.S. crew so they could see it was armed with missiles.
Russia says it is concerned about an increase in American recon flights and are basically keeping an eye on what is going on even though the flights have never come close to violating Russian airspace.