During the Soviet-Afghan War, one of the main annoyances for the Soviet troops was the presence of Mujahideen bases in Pakistan. Whenever Soviet forces cleared an area of Afghanistan, the Mujahideen would simply relocate to Pakistan, regroup and resupply, and then continue their fight. America today is now facing a similar problem, which is the reason for US drone strikes in Pakistan. However, unlike the US, the Soviet Union never struck Pakistan. The Mujahideen camps, sheltered from Afghan and Soviet air strikes by the PAFs sparkling new F-16s, grew unhindered and became the Frankenstein that the Taliban is today. Propped up by Pakistani, US, Chinese, and Arab support, the Mujahideen went on to extract a severe toll on the Red Army (14,000 dead), and along with the poor economic condition of the USSR prompted its withdrawal. But now let's rewind back to 1985/86, when the Soviet presence was at its height. Realizing that most US aid to the Mujahideen was routed through Pakistan, and that Pakistan itself was the base of many Mujahideen groups, what if the Red Army invaded Pakistan with India's help? A combined attack on both fronts would wipe Pakistan off the map within a few weeks. The combined might of the Soviet and Indian forces would be far too much for Pakistan to handle, especially since they were not yet a nuclear weapons state. My question to DFI members: How come the Soviet Union never invaded Pakistan?