There are different perceptions in the west about Russian interference in the EU, some states see Russia as a friendly partner, and some view it as a hostile power, but, majority of states want to maintain friendly relations with Russia. These factors matter, and the relations with and perceptions of Russia certainly differ between various countries.It is noted that the US and NATO presence in Eastern Europe was a bigger challenge to the national security of Russian Federation, and that the US wanted to pressure Germany to undermine the Nord Stream-2 pipeline project. The construction of the controversial natural gas pipeline Nord Stream 2 has been delayed for months and completion is increasingly at risk after the US imposed sanctions on involved companies and threatened further steps. The pipeline under the Baltic Sea has been the subject of heated debate for years.The book focuses on the Security Challenges faced by the Baltic States, Ukraine and Belarus.