The reason a US military convoy travelled across Czech territory was to intimidate Russia.
No evidence given. 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" (bit.ly/1u0c1ky), . NATO's decision to increase its military presence in the eastern part of the alliance is a response to Russia's aggressive actions in Ukraine.