Upvote:3
In the 17th and 18th centuries, the Kamchatsky Peninsula was settled by Cossack tribes and established a lasting presence there. Not Mongolia, but qualifies as an Asian locale.
Source: Google Maps, fair use
Their descendants are found there today and constitute a unique ethnic group.
Source: Yuri Kozyrev, Far East Russia | Noor, fair use.
The Peninsula is accessible by land, air, and sea routes and if you do not carry a Russian passport you will need a visa. I haven't been there in a long time, but recall the people to be friendly and curious. You will be able to meet lots of people in Asia whose height is in the same area as yours.
A working knowledge of Russian is essential. Try to get there soon because Putin's government is considering closing some of it in the same way that Seversk, along with other sensitive cities, are going to be closed again. Getting in to a closed region is a real hassle and not something I would advise in the first instance (IMHO).