REUTERS

EU diplomats noted that at the OSCE Permanent Council in Vienna, the sixth anniversary was being marked of the illegal annexation of the Crimean Peninsula by Russia.

The delegation says the EU remains committed, "including through restrictive measures", to "non-recognition" of this act, which was "in violation of international law and OSCE commitments.

"Human rights situation in Crimea deteriorates since Russia's illegal annexation: systematic repression of those opposing the annexation and restriction on fundamental freedoms and persecution of Crimean Tatars. EU calls for full compliance with international human rights standards," the separate tweet reads.

The tweets were complimented with a "CrimeaisUkraine" hashtag.