Since the early 1990s, Estonia is involved in active trilateral Baltic states co-operation with Latvia and Lithuania, and Nordic-Baltic co-operation with the Nordic countries. The Baltic Council is the joint forum of the interparliamentary Baltic Assembly (BA) and the intergovernmental Baltic Council of Ministers (BCM). Nordic-Baltic Eight (NB-8) is the joint co-operation of the governments of Denmark, Estonia, Finland, Iceland, Latvia, Lithuania, Norway and Sweden. Nordic-Baltic Six (NB-6), comprising Nordic-Baltic countries that are European Union member states, is a framework for meetings on EU related issues. Parliamentary co-operation between the Baltic Assembly and Nordic Council began in 1989. Annual summits take place, and in addition meetings are organised on all possible levels: speakers, presidiums, commissions, and individual members. The Nordic Council of Ministers has an office in Tallinn with a subsidiary in Tartu and information points in Narva, Valga and Pärnu. Joint Nordic-Baltic projects include the education programme Nordplus and mobility programmes for business and industry and for public administration.

Which Baltic countries have cooperated with Estonia since the early 1990s?