The Tashkent Agreement was a peace treaty signed between India and Pakistan in January 1966, mediated by the Soviet Union. The Soviet leader who played a crucial role in this agreement was Alexei Kosy

The Tashkent Agreement was a peace treaty signed between India and Pakistan in January 1966, mediated by the Soviet Union. The Soviet leader who played a crucial role in this agreement was Alexei Kosygin.

The correct option is (C).

• (A) Stalin was the leader of the Soviet Union until 1953, well before the Tashkent Agreement.
• (B) Gorbachev was the last leader of the Soviet Union, much later than 1966.
• (C) Kosygin was the Premier of the Soviet Union at the time of the Tashkent Agreement and hosted the talks.
• (D) Khrushchev was removed from power in 1964, before the agreement was signed.

The final answer is $\boxed{\text{C}}$.