On November 21, Minsk /BelTA correspondent/. Belarus, Kazakhstan and Russia are moving to the next stage of integration building – the Single Economic Space. This was announced on November 18 by the presidents of the three countries, Alexander Lukashenko, Dmitry Medvedev and Nursultan Nazarbayev, who signed the Declaration on Eurasian Economic Integration following a meeting in Moscow, BelTA was informed by the press service of the Belarusian leader. The document notes that the further development of integration of the three countries meets their national interests, contributes to solving the common tasks facing them in improving the welfare and quality of life of citizens, sustainable socio-economic development, comprehensive modernization and strengthening of national competitiveness within the global economy. In accordance with the declaration, the SES is based on the principles of observance of generally recognized norms of international law, including respect for sovereignty and equality of states, affirmation of fundamental human rights and freedoms, the rule of law and a market economy. In their practical cooperation, the SES states intend to be guided by the norms and rules of the World Trade Organization. The declaration confirms the importance of all three states joining it. The document takes into account Belarus' proposal on the possible creation of joint transnational corporations to deepen industrial cooperation. The declaration also includes the proposal of the Belarusian side on striving to further strengthen comprehensive mutually beneficial and equal cooperation of the Customs Union and the SES with other countries, international integration associations, including the European Union, with a view to creating a common economic space. In addition, the declaration states the parties' aspiration to complete the codification of international treaties that form the legal framework of the Customs Union and the SES by January 1, 2015, and to create the Eurasian Economic Union on this basis. It is also noted that the SES will be open for accession by other states that share the goals and principles of the union and are ready to implement them.