The European Union said it had joined members of the Council of the Baltic Sea States (CBSS) in suspending Russia and Belarus from the Council's activities.
"This decision is a part of the European Union’s and like-minded partners response to Russia’s invasion of Ukraine and the involvement of Belarus in this unprovoked and unjustified aggression," it said on Saturday.
"The EU agrees with the other members of the CBSS (Denmark, Estonia, Finland, Germany, Iceland, Latvia, Lithuania, Norway, Poland and Sweden) that the suspension of Russia and Belarus will remain in force until it is possible to resume cooperation based on respect for fundamental principles of international law," it added.
Since President Vladimir Putin's army invaded on February 24, Russia has pummeled Ukrainian cities, killed hundreds of civilians and assaulted Europe's largest atomic power plant.
The invasion has drawn condemnation and severe sanctions from Western nations balancing punishment of the Kremlin with fears of a hazardous escalation.