Ukrainian President Volodymyr Zelensky has said Russia may return to the G7 after it ceases aggression against Ukraine.

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"The return of occupied Crimea, the cessation of hostilities in Donbas and the release of over 100 political prisoners and Ukrainian sailors held by the Kremlin will be a real serious signal to the world that Russia is ready to once again take its place on the agenda of high diplomacy," Zelensky wrote on Facebook.

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The president also thanked the countries that consistently support Ukraine in upholding territorial integrity and sovereignty.

Earlier, a CNN source said U.S. President Donald Trump and French President Emmanuel Macron allegedly believe Russia should be invited to a G7 summit next year. The source said the idea was voiced by Macron and supported by Trump.

At the same time, a diplomatic source in France told Reuters that Russia's access to the Group of Seven depended on progress in Ukraine peace talks.