This is of concern certainly with the tension surrounding the two countries.
Check it out:

Russian strategic nuclear bombers entered U.S. airspace at least 16 times during the past 10 days, marking an unusually sharp increase of aerial incursions, The Washington Free Beacon reported.

The intrusions by Tu-95 Russian Bear H heavy bombers prompted the scrambling of U.S. fighter jets on several occasions. On one occasion, a Russian intelligence-gathering jet was detected along with the bombers near Alaska.

“Over the past week, NORAD has visually identified Russian aircraft operating in and around the U.S. air defense identification zones,” said Maj. Beth Smith, spokeswoman for U.S. Northern Command and the North American Aerospace Defense Command told the Beacon.