PUTIN FOR U.N. LEADING ROLE IN INTERNATIONAL SECURITY MOSCOW, MARCH 6, 2001 /FROM RIA NOVOSTI CORRESPONDENT OLEG OSIPOV/ -- The UN has been, is and must remain the leading international organisation ensuring and overseeing international security, said President Vladimir V. Putin of Russia on Tuesday wrapping up Kremlin negotiations with Nigerian President Olusegun Obasanjo. The head of the Russian state added that the UN activities must live up to the geopolitical realities of today.