MOSCOW, Sept 9 (Reuters) - The Moscow Exchange will start trading foreign securities in U.S. dollars from Sept. 27, the head of the bourse’s stock market department, Boris Blokhin, said on Thursday. The exchange said in July it was planning to expand the number of foreign securities on offer to 1,000 by the end of 2022, focusing on U.S. companies as well as shares from Hong Kong, China and Europe. Trading is currently only offered in roubles. (Reporting by Elena Fabrichnaya; Writing by Alexander Marrow; Editing by Kevin Liffey)