Russian tu-95 nuclear-ready bombers have twice approached US airspace near Alaska last month, most recently on September 11.
But the Russians have a long history of sending the Tu-95s to the US, and even significant data, such as July 4, 2015, when US jets intercepted a pair of bombers.
While the probe flights of the Russian nuclear bombers are so widespread that they do not cause a general alert, they certainly play a role in Moscow's preparations for nuclear attacks on the US.
The Tu-95 has a great range and the ability to shoot cruise missiles of very long range. In a fight against the US, Russia's decades-long main rival, the Tu-95 would probably fire nuclear or conventional cruise missiles at Alaska's radar and missile defense stations.
In fact, Russian media reported between the two Tu-95 interrupts in September that the Cold War bombers tried long-range missile fires.
It is unclear whether the specific Tu-95s testing American airspace have recently taken part in Russia's large-scale exercises, but Moscow has a limited number of old aircraft and is unlikely to fly them without a target.
The bombers that flew on September 11 brought Su-35 fighter jets, some of Russia's best fighter jets, to accompany them for the ride.
Apart from the fact that Russia could launch the nuclear war against the US, Russia could also have the advantage of being able to take a look at the F-22 on its radars.
The F-22, a 70-foot aircraft, has the radar signature of a marble. This puts the fighters of Russia in a nightmare situation when it comes to finding the aircraft in the air. So it can provide helpful military intelligence if you fly it close up and scan it.