"We need to consider a more persistent NATO military presence in the [Black Sea] region – with a particular focus on our maritime capabilities – a presence which is robust, certainly, but also defensive in posture, non-permanent, and in compliance with the Montreux Convention, which regulates and limits the transit of non-Black Sea state warships through the Bosphorus and the Dardanelles," Vershbow said, as quoted in the speech published on NATO website.
He added that the alliance had already implemented a number of assurance measures in the region, such as intensification of NATO maritime patrols in the Black Sea, surveillance flights of AWACS (airborne warning and control systems) in the region and presence of the US Marine Corps Black Sea Rotational Force in Romania.
NATO has been increasing its military presence in Eastern Europe and the Black Sea since the outbreak of the conflict in southeastern Ukraine in April 2014, in response to what it considers Russia's aggressive foreign policy.
Moscow has repeatedly dismissed the Ukraine-related accusations leveled at it, warning that increased NATO activities near the country's borders could undermine regional and global stability.