* Improper to set final date for gas supply pact - ambassador * Says ESPO crude exports to china at 6.25 mln T as of June 1 * Sino-Russian trade forecast to reach $70 bln in 2011 (Adds details, background) By Jim Bai and Tom Miles BEIJING, June 10 (Reuters) - China and Russia are still negotiating a massive natural gas supply pact and it would be inappropriate to set a date for the companies involved to conclude the deal, Russia's ambassador to China said. "The size of the deal is huge ... and there are two documents -- an agreement between the two governments and a long-term contract between the companies -- to be agreed on. It's an arduous task and it cannot be done before a certain date," Sergey Razov said on Friday. "Many principles have been agreed, and some important issues have yet to be settled." "As a seller, Russia wants higher gas prices; as a buyer, China hopes to get lower prices," Razov told reporters at a press briefing in Beijing. "We hope the negotiations are finished as soon as possible." On May 31, Russia said it would finalise a major gas supply deal with China in time for a visit in mid-June by Chinese President Hu Jintao, wrapping up years of talks to open a new export route to the world's biggest energy market. Russian Deputy Prime Minister Igor Sechin said he had reached a broad agreement at a meeting in Moscow with his counterpart Wang Qishan to supply China with 68 billion cubic metres (bcm) per year of gas over 30 years

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