NATO called  illegal and illegitimate the referendum held on 16 March in Ukraine’s Autonomous Republic of Crimea.
The statetement issued by NATO said the referendum violated the Ukrainian Constitution and international law, and Allies do not recognise its results.

"We urge the Russian Federation to de-escalate the situation, including by ceasing all military activities against Ukraine," the statement reads.

The Alliance called on Russia to honour all its international commitments, return to the path of dialogue and seek a peaceful, political solution, including through direct dialogue with the government of Ukraine.

"We therefore urge the Russian Federation not to take any steps to annex Crimea, which would be a clear violation of the United Nations Charter.

NATO Allies reiterate their full support for the sovereignty and territorial integrity of Ukraine, and for the principle of the inviolability of its internationally recognized borders".