July 28 (Reuters) - Russian e-commerce firm Ozon on Friday said its American depositary shares had been admitted to trading on Kazakhstan's Astana International Exchange (AIX), a move that could increase liquidity as it fights to keep its primary Nasdaq listing.

Ozon said there were no plans to issue new shares in connection with its AIX listing. Trading would become effective on July 31, Ozon said. (Reporting by Alexander Marrow; Editing by Mark Trevelyan)