Report from the Commission to the European Parliament and the Council on cases where visa waiver non-reciprocity is maintained by certain third countries in accordance with Article 1(5) of Council Regulation (EC) No 539/2001 listing the third countries whose nationals must be in possession of visas when crossing the external borders and those whose nationals are exempt from that requirement, as amended by Regulation (EC) No 851/2005 as regards the reciprocity mechanism (COM(2006) 568)