They would be a better fit in the United States, especially the Southern, Midwestern, and Plains states, but even the Trump Administration made no move to encourage their immigration.
Catherine the Great brought in many thousands of German Mennonite settlers in the 18th Century, but Russia was less developed at the time. Even so, their cultural differences and opposition to compulsory military service made them a problem for the later Tsars. Later, the Communists severely persecuted them. Many of the Mennonites emigrated to the U.S. and Canada to escape both the Tsars and the Communists.
It would be less of a stretch for them to convert to Orthodox in order to assimilate than it has been for those of non-Christian belief, i.e. most other European invaders immigrants.