MOSCOW (Dow Jones)--Russian natural-gas monopoly OAO Gazprom (GAZP.RS) is interested in buying U.K. energy giant BP PLC's (BP) stake in Shah Deniz field in the Caspian Sea, if the stake is offered for sale, Gazprom's Chief Executive Alexei Miller said Friday. BP has a 25.5% stake in Shah Deniz, which is the largest natural gas field in Azerbaijan. BP's spokesman in Moscow declined to comment. Miller also said Gazprom isn't interested in developing shale gas in the U.S. Miller said Gazprom is ready to contribute an upstream asset in Russia to a joint venture with Ukraine's gas monopoly Naftogaz, should such a venture appear. -By Jacob Gronholt-Pedersen and Alexander Kolyandr, Dow Jones Newswires; +7 495 232 9197; [email protected] (END) Dow Jones Newswires June 25, 2010 09:22 ET (13:22 GMT)