Correct option is A
The exercise Zapad-2025 is a joint military drill organized by Russia and Belarus.
India sent 65 personnel (57 from Army, 7 from Air Force, 1 from Navy) to participate in this exercise at the Mulino training ground, near Nizhny Novgorod, Russia.
The aim of participating is to strengthen military cooperation, share tactics, and enhance interoperability with allied forces