Actually Yvette is a Moldovian, not a Russian.
Moldovians have a reputation in eastern Europe as being the second worst crooks after the Chechens. The only reason the Russians in Israel vote for Yvette is because he speaks Russian.
Remember that "Russian Jews" in Israel includes those from Russia, White Russia, Ukraine, Moldovia, Uzbekistan, Birobidjan, Georgia, Tadjikistan, Kazakstan etc. Although they all speak Russian, their mindsets are quite different.