Explanation:
The Soviet Union provided support to the MPLA (Popular Movement for the Liberation of Angola) in Angola in 1975 for several reasons. Firstly, the MPLA was a Marxist-Leninist party, and thus shared ideological similarities with the Soviet Union, which was also a communist state. Supporting a fellow socialist movement aligned with the Soviet Union's interests in spreading communism globally.
Secondly, Angola was rich in natural resources, including oil and diamonds, and thus was a valuable target for foreign investment and influence. The Soviet Union saw supporting the MPLA as a way to gain access to these resources and establish a foothold in Africa, which was a region of strategic interest to both the Soviet Union and the United States during the Cold War.
Thirdly, the Soviet Union had a longstanding policy of supporting anti-colonial movements and national liberation struggles across the globe, and saw the MPLA's fight against Portuguese colonialism as part of this broader struggle. By supporting the MPLA, the Soviet Union was able to position itself as a champion of national liberation movements and anti-colonialism, which helped to strengthen its image globally.