The article tries to answer the question of how Ukraine created cooperation with NATO in the perspective of freezing the Donbas conflict in the East. Pursuant to the decisions from the Newport and Warsaw summits, NATO returned to its traditional functions of defence and strengthened the Eastern flank of the Alliance. In the context of the Ukraine crisis, East and Central European countries have called for a significant strengthening of NATO’s deterrence and defence policy and for the non-permanent deployments of Allied troops in the region. NATO
decided to maintain its open-door policy toward Ukraine; however, its membership has been postponed due to geopolitical change in Europe.