Russia's Defence Ministry has summoned an US official after an incident over sea of Japan near Russia's eastern borders, where an American spy plane was detected flying too close to civilian aircraft.
Russia's air defence detected an RC-135 spy plane belonging to US Air Force on Sunday, the ministry said in its statement, according to a report, the plane was on an air reconnaissance mission with all of its transponders having been shut off, it added.
The US crew had not provided any information regarding its flight to air traffic controllers in the region, despite it flying at the same altitude as scheduled civil aviation flights.
“As the result of the unprofessional actions of the American plane crew, the hazard of a collision with civil aviation planes was created," Russia's Defence Ministry said, adding that it asked the
US official to take steps to prevent such incidents from happening near Russia's borders in the future.
At least two passenger jets were endangered by the then-unknown aircraft over the neutral waters of the Sea of Japan on Sunday, Interfax reported.
The "unknown aircraft" was flying at the altitude of some 11,000 meters (36,000 feet) and did not respond to air traffic control, the agency said citing its source. Russian air controllers had to immediately change the flight path of a KLM Boeing-777, which was in the same region en route from Japan to Holland.