Foreign vessels will require the approval of Russia's FSB security service to access the country's ports, according to a decree signed by President Vladimir Putin. The decree said that permission from port authorities for foreign ships to enter would need to be agreed with the FSB,

President Vladimir Putin has tightened rules for ships entering Russian sea ports from abroad, giving the nation’s main security service a bigger role following a series of mysterious blasts on oil tankers.

Russian President Vladimir Putin signed on Monday a decree stipulating that vessels arriving from foreign ports may enter Russian seaports only with the approval of the Federal Security Service (FSB).