 A member of the German delegation to the Parliamentary Assembly of the Council of Europe (PACE), he also served on the Sub-Committee on relations with the Organisation for Economic Co-operation and Development (OECD) and the European Bank for Reconstruction and Development (EBRD).Wellmann also was an OSCE election monitor in the Ukraine.In May 2015, Russia refused his entry at Moscow airport until the year of 2019, though he had been officially invited by the Foreign Committee of the Russian Federation Council.