Russian president 's trip intended to strengthen ties with Cuba . Relations between the two countries cooled when Cold War ended . Solving lifting of U.S. trade embargo on Cuba among items on agenda . Russian President Raul visited U.S. in almost 30 years ago .
Cuban president 's trip intended to strengthen ties with Russia . Relations between the two countries cooled when Cold War ended . Solving lifting of U.S. trade embargo on Cuba among items on agenda . Russian President Dmitry Medvedev visited Cuba in November .