In the United States, a farthest radar and control (DRLOIU) Boeing E-3 C Sentry has been brought to the sky. This happened before the meeting of the White House head Donald Trump and Russian President Vladimir Putin. About this witness Flightradar24 service data.

According to the service, at the same time, Russian aircraft Tu-214PA flew in the sky above Alaska, belonging to the special Russian fleet. The aircraft was created on the basis of the Tu-214 passenger aircraft, but it was also a military command for Russia's highest leadership.
In return, Boeing E-3 Sentry performs the functions of Sentinel and Command Aviation. It is equipped with nine -meter rotation radar and can detect objects within a radius of up to 400 km.
It is known about the operation at the location of the Putin and Trump summit
Remember that Putin and Trump's meeting in Alaska will start at 22:00 Moscow.