MIKHAIL KLIMENTYEV/AFP/Getty Images
Turkmen President Gurbanguly Berdimukhammedov (C), Kazakh President Nursultan Nazarbayev (R) and Russian President Dmitry Medvedev (L) during a meeting in Turkmenistan on Sept. 13
U.S. oil major Chevron's involvement in developing a Turkmen natural gas field could prompt Russia to put pressure on Turkmenistan if energy exports to Russia are jeopardized.
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