Modifikuotas vienpoliškumas tarptautinėje sistemoje 2001–2010 metais ; Modified unipolarity in the international system (2001-2010)
After the end of the Cold war the unipolar international system was established and during recent decade it was transformated from strickt unipolarity (1990-2000) to modified unipolarity (2001-2010). Exceptional and multidimensional power with the global reach of the USA was the reason for naming structure of international system as strict unipolar till terrorist attacks of September 11, 2001 in the USA. After September 11th the USA started to act less unilaterally than before temporary changing the unilateralism to multilateralism for collective actions against terrorism in Afghanistan. The multilateral response to September 11th terrorist attacks became the first stage of transformation of strict unipolarity based on Article 5 of Washington Treaty. Years of 2001-2003 could be named as the beginning of modified unipolarity: sole superpower acted multilaterally in war against terrorism and at the same time it promoted the enlargement of its influence with NATO enlargement to the post soviet area. Formation of transformed unipolar structure allows speaking about the necessity of defining a new type of unipolarity – modified unipolarity which is theoretically balancing on the dividing lines of unipolarity, multipolarity and nonpolarity concepts. This article consists of broad definition of modified unipolarity, theoretical analysis of polarity and its transformation, also, some preliminary conclusions and insights are made concerning possible transformation of modified unipolarity in the foreseen future.