Thirty years after the post-Soviet republics’ independence was proclaimed and internationally recognized, the nations of the Eastern European region continue to struggle to protect their sovereignty, against the backdrop of permanent political and economic instability, military conflicts, and security challenges. In this paper it is argued that pro-Western orientation and desire to participate in Western integration projects have deepened the sovereignty crisis and exacerbated long-standing conflicts in the region. This article attempts to analyse whether this damage has occurred as a result of the European and Euro-Atlantic choice of the East European countries or whether it can be attributed to a number of domestic and external factors, which existed before these countries became independent.