Hanko Naval Base

Hanko Naval Base was a Soviet naval base from 1940 to 1941 in the town of Hanko at the Hankoniemi peninsula which is located 100 kilometers (62 mi) from Helsinki, the Finnish capital.

Hanko Naval Base location on a map

History

The Soviet Union had demanded from Finland a military base in the writing of regional exchange requirements just before outbreak of the Winter War from Hankoniemi peninsula.

After the Winter War, in the early Spring of 1940, the Soviet Union repeated its call for a naval base in the Hankoniemi area.

Finland's negotiation delegation was forced to agree to the Soviet Union's peace terms, including the Hankoniemi base. On March 12, 1940, the Moscow Peace Treaty included a lease to the Soviet Union, for 30 years, of 115 square kilometers of territory which included the area of Hankoniemi and the City of Hanko surrounding maritime areas, as well as about 400 islands.

The area was handed over to the Soviets at Midnight on 22 March 1940. The Finnish population had been evacuated from the area, causing about 8,000 Finns to lose their homes. Soviet Union forces built a strong military base. It oversaw maritime traffic in the Gulf of Finland, and was also a potential south-west invasion front for war against Finland. The base was occupied by infantry, airborne and armored forces. The Soviet Union fortified the border between Finland and the base, and the Finnish forces invested in troops and fortifications on their side.

Outbreak of the Continuation War

Battles of the Continuation War that took place at the borders of the leased area were quite limited. The Finns did not try to assault the Hanko Soviet forces. However, the Soviet Union withdrew its troops from the leased area on December 2, 1941. The troops left their leased area heavily mined, which hampered the return of the civilian population in the Hanko peninsula.

After the Continuation War, the Soviet Union demanded instead of Hanko lease area of Porkkala. The final turnover of the Hanko leased area was included in the Paris Peace Agreement in 1947.

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