According to Esper, the Kremlin is blocking US flights over Kaliningrad and Georgia, despite the terms of the agreement.
It is worth noting that the Open Skies Treaty was signed in 1992 in Helsinki and entered into force in 2002. It was signed by 34 countries, including Russia.
"This Treaty establishes the regime, to be known as the Open Skies regime, for the conduct of observation flights by States Parties over the territories of other States Parties, and sets forth the rights and obligations of the States Parties relating thereto," the text of the Article 1 says.
As we reported earlier, Russia's Sukhoi Su-57 stealth fighter could be equipped with a hypersonic air-to-ground missile; the projectile can fit in the aircraft's internal weapon bay, which would make the fighter even harder to detect by the radars.
The information was provided by The Diplomat, citing a source in the Defense Ministry.