By Amiram Barkat, Haaretz Correspondent Russian tycoon Vyacheslav Moshe Kantor, an associate of President Vladimir Putin, is the leading candidate for president of the European Jewish Congress in next week's elections in Brussels. Kantor is supported by a number of European Jewish community leaders, but a few have warned against electing a close ally of the Russian government. Some Israeli officials fear that as president of the umbrella organization, Kantor could undermine Israel's efforts to prevent Iran from developing nuclear weapons. Kantor, 54, says that his close links to the Kremlin are good for the Jews and might prove helpful...