Северная группа войск
Soviet troops (the Northern Group of Forces) were stationed in Poland from 1945 until 1993. It was only in 1956 that official agreements between communist regime in Poland established by Soviets themselves and Soviet Union recognized the presence of those troops; hence many Polish scholars accept the usage of term 'occupation' for period 1945–1956. Other scholars date the Soviet occupation until 1989. The Polish government-in-exile existed until 1990.