Russia is testing its nuclear capabilities after the Biden administration promised to send rocket systems to Ukraine. The reports come from the Interfax News Agency, a news outlet based in Moscow. The exercises involve the Teykovskaya division of the Strategic Missile Forces (RVSN), a special branch of the Russian Armed Forces. One thousand military personnel and 100 vehicles are said to be participating in the recent drill. The exercises include the vehicles carrying the YARS missile, an ICBM that is reported to travel up to 6,500 miles. “It is equipped with multiple warheads with maneuvering…