"A prepayment has been agreed, agreed in
principle, details are being discussed. It's $25 billion,"
Medvedev told journalists on the sidelines of the St Petersburg
International Economic Forum.
Russia and China signed a 30-year gas supply contract, worth a
total of more than $400 billion, earlier this week during
President Vladimir Putin's visit to the country.
(Reporting by Katya Golubkova; Writing by Lidia Kelly)
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