The Soviet Union was the first country to establish diplomatic relations with Afghanistan after the Third Anglo-Afghan war and signed an Afghan-Soviet nonaggression pact in 1921, which also provided for Afghan transit rights through the Soviet Union.
The Soviet Union was the first country to establish diplomatic relations with Afghanistan in 1919 Amin Saikal, Ravan Farhadi, Kirill Nourzhanov. Pg 64 after the Third Anglo-Afghan war and signed an Afghan-Soviet nonaggression pact in 1921, which also provided for Afghan transit rights through the Soviet Union.