The increase in tensions between East and West during the Cold War, resulting in western intelligence services shifting their focus to East Germany as the Warsaw Pact's major deployment zone. Nowhere else did western services get as close to Soviet military equipment. Their prime targets were missiles, nuclear depots and airbases. At the same time, the KGB, as well as Soviet military intelligence, were sending their spies to reconnoitre Nato forces in the West. The game of spies was in full swing.