The common defence line agreement was signed to block Russian aggression in the region. The Baltic States have signed an agreement to create a common defence line to reinforce NATO's eastern border with both Russia and Belarus. Latvia, Lithuania and Estonia were once all part of the Soviet Union but are now part of the EU and NATO and are allies of Ukraine, where Russia launched a full-scale invasion in in February 2022. The countries' defence ministers signed the document in Latvia's capital Riga. The three believe constructing "anti-mobility defensive installations" will significantly strengthen their borders, as well as deter...