By Huw Jones and Carolyn Cohn LONDON (Reuters) – Two thirds of funds in Luxembourg with heavy Russian exposure have been suspended following the Ukraine invasion, the Grand Duchy’s securities regulator said on Tuesday, adding that the sector’s Russian exposure is limited to 0.3% of total assets under management. Claude Marx, director general of the Commission de Surveillance du Secteur Financier (CSSF), which regulates funds in Luxembourg, one of Europe’s top fund centres, said total exposure to Russia was 18.2 billion euros ($20.02 billion), with two-thirds in equities and the rest in bonds. …