The NATO summit that convenes in Warsaw on July 8 was always going to be unusually important because of the recent sharp deterioration in the west's relationship with Russia. Now, following Britain's vote to leave the EU, the Warsaw summit is shaping up as a crucial test of the coherence of the western alliance - which must follow through on tough and potentially divisive decisions, intended to strengthen western deterrence of Russia.
Financial Times: NATO’s Warsaw summit is a test the west must pass
Defence ministers attend the Nato Defence Council meeting at the NATO Headquarters in Brussels on June 15, 2016.