The executive power of the Union is vested in

Explanation

1. 01

   Article 53 vests the executive power of the Union in the President.

2. 02

   That power is exercised by the President either directly or through officers subordinate to him, and in practice on the aid and advice of the Council of Ministers.

3. 03

   So the Prime Minister leads the government but the power itself is formally the President's.