where frost when mission rescue russia president cod mwr 3 2011

Frost is the Delta Force operative in MW3 who’s involved in the Berlin rescue mission for the Russian president’s daughter, Alena Vorshevsky. In that mission, he’s injured by an explosion during the attempt to breach the room, and the rescue fails when Alena is taken away.

If you meant the later rescue of the Russian president himself, that happens in the mission “Down the Rabbit Hole,” where Frost is not the main playable character; the operation is led by Price and Yuri, with Frost only mentioned in some sources.

Mission context

• Scorched Earth : Frost is part of Team Metal in Berlin, helping secure Alena.

• Down the Rabbit Hole : the team then moves to rescue President Boris Vorshevsky from the diamond mine.

Simple answer

Frost is in Berlin , on the mission to rescue the president’s daughter, and he gets taken out by the explosion before the extraction succeeds.

TL;DR: Frost is tied to the daughter rescue mission in Berlin , not the president rescue itself.