REUTERS

"It is planned for tomorrow," the EU Council said.

Read alsoAustrian foreign minister calls for improving relationship with Moscow – ReutersUNIAN memo. In March 2014, after the Russian troops invaded Crimea, Russia annexed the Ukrainian peninsula, having organized a sham "referendum" on self-determination.

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

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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.