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Xi hosted Putin in China last month during which the two allies signed a massive $400 billion natural gas supply deal.
The deputy head of Russia's Rosatom company, Nikolai Spassky, arrived in Tehran on Monday for a two-day visit.
Russian President Vladimir Putin has said Russia is interested in Chinese businesses' participation in developing the Far East.
He, however, warned that the peace plan "will not be viable and realistic without practical steps towards negotiations."
Russia called for thorough and unbiased investigations into the May 2 tragedy in Ukrainian city of Odessa.
The east route pipeline will start providing China with 38 billion cubic meters of natural gas annually from 2018.
The Russian energy giant will now be filing a lawsuit against Naftogaz with the Stockholm Chamber of Commerce Arbitration over the pending payment.
The Ukrainian government has said preparations are on to file a lawsuit with the Stockholm arbitration court over the dispute.
Russian FM Lavrov says Moscow warned the US and UK that adventurism in Iraq would not end well.
He said conditions proposed by Gazprom to Kiev were "absolutely identical" with those to ousted President Yanukovych's government.