The escalating tensions between Iran and the United States could lead to a new worldwide nuclear catastrophe. Former Cuban leader Fidel Castro in his article published on Monday warned that as soon as U.S. and Israeli warships try to inspect the first Iranian cargo ship, it will be the exact moment when the terrible war will begin. Castro handed over power to his brother Raul due to health problems in 2006 and has since devoted himself to editorials on major world issues. <br/> The UN Security Council adopted a resolution earlier this month imposing new sanctions against Iran over its controversial nuclear programme, including restrictions on its shipping and air cargo operations.<br/>