On October 31, 1979, Soviet informants under orders from the inner circle of advisors under Soviet General Secretary Leonid Brezhnev relayed information to the Afghan Armed Forces for them to undergo maintenance cycles for their tanks and other crucial equipment. Meanwhile, telecommunications links to areas outside of Kabul were severed, isolating the capital. With a deteriorating security situation, large numbers of Soviet Airborne Forces joined stationed ground troops and began to land in Kabul on December 25. Simultaneously, Amin moved the offices of the General Secretary to the Tajbeg Palace, believing this location to be more secure from possible threats. According to Colonel General Tukharinov and Merimsky, Amin was fully informed of the military movements, having requested Soviet military assistance to northern Afghanistan on December 17. His brother and General Dmitry Chiangov met with the commander of the 40th Army before Soviet troops entered the country, to work out initial routes and locations for Soviet troops.