Russia wants a long-term peace deal over Ukraine that tackles what it regards as the root causes of the conflict and not a quick U.S.-backed ceasefire followed by a swift restart of fighting, a senior Russian diplomat told the RIA news agency.

Russian President Vladimir Putin said on Monday that Russia was not opposed to Europe's involvement in Russia-U.S. peace talks aimed at settling the conflict in Ukraine, but noted that Brussels had long rejected any dialogue with Moscow.

The U.S. voted against a U.N. resolution laying blame on Russia for its invasion of Ukraine and demanding Moscow remove its troops from Ukrainian territory.