Abstract
Reborn after WWI, Poland needed to secure its borders properly against a potential enemy. As a result of the undertaken negotiations, the state strengthened the protection of its eastern border with a Polish-Romanian alliance. Before WWII, Romania was an important ally of Poland in the region and the only neighbour with whom Poland had a good relationship. Currently, both states are members of the EU and NATO, and their interests in security converge, especially in the face of deteriorating security in Eastern Europe. Closer military cooperation is also favoured by extensive political contacts and increasing expenditure on defence in both those states. In fact, Romania may well become the main ally of our country in the region within the next few years