REUTERS

"As for Crimea, we think this issue closed once and for all. It was a historic decision of people living in Crimea," he said at a news conference after his talks with the Greek leaders, TASS wrote.

"Russia will indulge in no discussions with anyone on that matter," Putin stressed. "So, let us stop raising this matter over and over again."

Read alsoPoroshenko pledges to retake Crimea, Donbas the way Savchenko returnedUNIAN memo. In March 2014, after the Russian troops invaded Crimea, Russia annexed the Ukrainian peninsula, having organized a sham "referendum" on self-determination.

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The self-proclaimed Crimean government said that 96.77% of participating voters had supported Crimea's accession to Russia.

Ukraine designated the Crimean referendum as illegitimate.

On March 18, 2014, the Kremlin signed the so-called "Treaty of Accession" regarding Crimea and Sevastopol, Russia's naval base in the Black Sea.

Western countries did not recognize the annexation of Crimea and introduced a series of economic sanctions against Russia and Crimea.