When Jews return to Israel from various countries, are they still Jews?
Yes. Even after nearly 2,700 years of dispersion among the nations, Israelites remain Jews. When God brings them back to the land—whether from Russia or anywhere else—they are still Jews, though they may not know their tribe; God knows.
Les explains that the 144,000 are Jews, sealed from all the tribes of the children of Israel, not just two tribes. Despite being dispersed among all the nations for almost 2,700 years, they are still Jew. When God brings them back to the land, whether out of Russia or wherever, they are Jews. Even though they themselves cannot tell what tribe they came from, God knows.