The NSA did not say who the Russian military hackers have targeted.
Russia says the move will make it more difficult for governments to interpret the intentions of other nations.
It was the third time in two months that Russian aircraft have intercepted Navy aircraft in the Sixth Fleet of operations.
Army Gen. Stephen Townsend said the move threatens a major escalation in the civil war.
Paul Whelan faces up to 20 years in prison if convicted of spying.
The administration says it wants out of the Open Skies Treaty because Russia is violating the pact.
President Donald Trump calls them “super-duper" missiles though they’re better known as hypersonic weapons.
The Defense Ministry said the incident involving a Mi-8 helicopter occurred near the town of Klin.
Sergey Lavrov said that the Russian military also will not conduct war games near the borders with NATO member nations.
President Donald Trump blamed Syrian President Bashar al-Assad for a suspected chlorine attack.