Ukraine's calculated counteroffensive tests NATO strategy and destabilizes Russia.

NATO-trained Ukrainian brigades armed with Western weapons and tactics are set to lead the country's counteroffensive against Russian-backed separatists. The training, which includes simulated war games and instruction on combined-arms warfare, aims to transform Ukraine's military into a modern force skilled in NATO's most advanced tactics. The success of the counteroffensive will be the biggest test yet of the US-led strategy of giving the Ukrainians weapons and training to fight like an American army might, but on their own.