"The result of the policy of the West and the regime in Kyiv can only be the disintegration of Ukraine into several states," added Patrushev, who is secretary of Russia's Security Council.
United Nations Secretary-General Antonio Guterres, on a visit to Moscow on Tuesday, said he was ready to fully mobilise the organisation's resources to save lives and evacuate people from the besieged Ukrainian city of Mariupol.
Guterres, who is also due to visit Kyiv, proposed a "Humanitarian Contact Group" of Russia, Ukraine and U.N. officials to seek opportunities "for the opening of safe corridors, with local cessations of hostilities, and to guarantee that they are actually effective".