The formation of a Soviet bloc
1. By 1948, most of the Eastern European countries had either been absorbed into the USSR or turned into satellite states, governed by parties closely linked to the USSR
2. In some cases this involved 'salami tactics', in which communist parties joined with socialists and liberals to gain power, but then isolated and eliminated their rivals 'slice by slice'
3. Stalin hoped that this buffer zone of satellite states would help to protect the USSR from a future invasion by the West