Every time you promise to down somebody, it can't be regarded as a professional behaviour, a source in the US Air Forces claimed in response to the acts of Iran.
It should be noted that activity of the US spy planes has concerned not only Iran for the last year. In the Far East the US drones made passenger airliners change their course several times. The US Air Forces have also significantly increased intensity of reconnaissance flights near the Russian borders in the Baltic and Black Seas.
The US Defense Intelligence Agency in its turn reported that Moscow shouldn't be indignant at constant flights of the reconnaissance aircraft at Russia's borders, especially above the Black Sea. According to them, now Russia should get used to control and take it as a norm.
While the Pentagon is surely allowed to be indignant at the Russian aviation's flying near the US borders and demand to stop flights of strategic bombers and reconnaissance aircraft.