The amphibious US Navy ship USS Fort McHenry from the 22nd marine expeditionary unit passes through the Dardanelles into the Black sea, informs a press-service of the U.S. Sixth fleet in Twitter account. before the U.S. special envoy for Ukraine with Kurt Volker said Washington should take steps to increase its presence in the Black sea. In addition, he said he considers it possible additional supply of lethal weapons Ukraine. The official representative the Ministry of foreign Affairs of Russia Maria Zakharova said that such statements are " nejrotoksichesky in nature and not aimed at the convergence of positions within the Ukrainian society." According to the press-Secretary of Russian President Dmitry Peskov, the relations of the Russian capital and the capital of the United States became a victim of provocation, which is arranged in the Kerch Strait the Ukrainian authorities. Shipping in the Straits of Bosporus and Dardanelles is governed by the Montreux Convention of 1936. In peaceful time the black sea powers may pass through the Straits of warships, notifying about it the Turkish authorities. For non-black sea countries there are a number of limitations. To close the Straits of Turkey only in case of war, besides all the warring parties. <span style="color:darkgray