The anti-missile system is part of the capital's Cold War-era line of defense, which has 68 nuclear tipped rockets ready to blast incoming strikes from the sky.
All but one of Russia's previous radar stations are based in the country's west, near Europe.
Both countries share land borders with Kim Jong Un's secretive state.
Thirty years after Gorbachev and Reagan signed a landmark deal to stop an arms race in Europe, the pact was on the fritz.
Kremlin media is claiming the "Satan 2" missile will be powerful enough to nuke an area the size of Texas or France.
Eight allies showcased NATO's smart defense concept, where one ship neutralizes a ballistic threat while others rush to its defense.
China objects to the deployment in South Korea of the THAAD, as the radar is capable of penetrating Chinese territory.
The Barak 8 is an advanced long-range missile that's part of a wider Israeli-Indian aerial defense system
Russian Space Command has unveiled four new radar stations, in an effort to rebuild their early-warning network