Murmansk is a seaport in northwestern Russia, at the end of a deep bay of the Barents Sea .
Hence, pair 2 is correctly matched .
The town, founded in 1915 as a supply port in World War I , was a base for the British, French, and American expeditionary forces against the Bolsheviks in 1918.
In World War II Murmansk served as the main port for Anglo-American convoys carrying war supplies to the U.S.S.R. through the Arctic Ocean.
The town is now an important fishing port, and its fish-processing plant is one of the largest in Europe .
Murmansk’s ice-free harbour makes it Russia’s only port with unrestricted access to the Atlantic and world sea routes .
St. Petersburg is a Russian port city on the Baltic Sea .
Hence, pair 2 is correctly matched .
A major historical and cultural centre and an important port, St. Petersburg lies about 400 miles (640 km) northwest of Moscow and only about 7°south of the Arctic Circle.
It is the second-largest city of Russia and one of the world’s major cities.
St. Petersburg is located on the delta of the Neva River, at the head of the Gulf of Finland .