The world has no other effective instrument to solve international problems, Vladimir Putin told UN Secretary General Kofi Annan on Monday.
"Some say the UN does not cope with the solution of difficult problem. I wonder how the international relations would be developing without the UN," the Russian leader said.
However, Moscow supports the formation of a top-level expert group to reform the UN, he added.
"We highly value your personal and UN efforts to settle crises," Vladimir Putin told Kofi Annan.