Russia's Deputy Foreign Minister Sergei Ryabkov said on Sunday that Moscow has not ruled out a trilateral meeting between the presidents of Russia, the U.S. and ‌China, state ⁠news ⁠agency TASS reported.However, before moving on to the ​actual preparations, it is necessary to understand what the meeting's agenda ​would be, Ryabkov said."Here, the main question boils down to how the substance of the meeting ​will be formulated, and ⁠what we ‌can expect as a result."Earlier this month, Kremlin aide Yuri Ushakov raised the possibility ⁠of Vladimir Putin, Donald Trump and Xi Jinping meeting at the Asia-Pacific Economic Cooperation summit in Shenzhen, China, in November.On Sunday, Ushakov was quoted by Russian news agencies as saying that while such a meeting of Russian, U.S. and Chinese leaders "would not be without ‌merit," its organisation was the prerogative of the summit's hosts."If they are able ​to ​organise such ⁠a meeting – and this requires a certain amount of diplomatic preparation – then I think it could take place," ​Ushakov said.The Kremlin also plans to set up bilateral meetings for Putin during the summit, including one with Xi Jinping, and, "if the opportunity arises," a meeting with Trump, Ushakov said.