Less than two weeks after Brussels and Beijing struck a surprise deal to avert an escalating trade dispute, their fragile rapprochement has descended into a battle over who blinked first. In Brussels and Berlin, officials are emboldened by what they consider proof that collective EU pressure can force Chinese concessions. Rather than resting on their laurels, they are cooking up a fresh batch of trade restrictions. Beijing, on the other hand, has bristled at the idea that it can be strong-armed...