Beijing and Moscow said they signed a much-anticipated contract to supply China with hundreds of billions of dollars worth of Russian natural gas following a decade of difficult talks. Neither side released details about the price, long the major sticking point of a deal. The two sides but said a final price would be negotiated later. Gazprom CEO Alexei Miller told Russian media that the two sides had signed a contract worth a total of $400 billion over its 30-year life. “This is Gazprom’s biggest contract. We don’t have a contract like this with any other company,” Mr. Miller told reporters in Shanghai, the Interfax news agency reported. Russian news agencies said the contract called for supplies of 38 billion cubic meters of gas a year, which would imply a price of about $350 per thousand cubic meters, at the low end of what Gazprom currently charges export clients. […]