The reason a US military convoy travelled across Czech territory was to intimidate Russia.
On the eve of the NATO summit in Warsaw the course of escalation will continue.
The Baltic countries, Poland, Romania and Bulgaria, are NATO’s anti-Russian bastions.
As stated by NATO heads of state and government at the Wales Summit in September 2014, "the Alliance does not seek confrontation and poses no threat to Russia. But we cannot and will not compromise on the principles on which our Alliance and security in Europe and North America rest".