It is the religion of the Jewish people. 3 times a day Jews pray for return of the Jewish people to the land of Israel and a rebuilding of the temple in Jerusalem. 90% of Russian Jews have left Russia, a pleasing development both to Jews and to Russians. It has been a difficult 300 years there and it was time to go home. As for texts, I would expect that Russia will give them up eventually once it realizes they have no value sitting in Russia which has a small and shrinking Jewish population. Perhaps as a gesture of good will.
NATO backs Turkey's fight against ISIS (Reuters)
from the article: Russia won't return disputed Jewish texts to U.S., Putin says