Probably Mig-31. Their characteristics probably fit Russia’s geography very well. Apparently a new modification called Mig-31I “Ishim” will be revealed on “Army 2022” forum, which starts…today.

There’s info about Mig-31BM modification reaching speeds of 3400kph…

P.S. Supposedly the “new” modification is a launch platform for missiles and light satellites, and was likely shown on Victory Parade this year.