The US attack on Iran without consulting European allies sparks questions about Nato's willingness to engage in conflict over Taiwan.

The United States attacked Iran without consulting its European allies. President Donald Trump assumed the operation would be a quick win, over before anyone had to take a position. Instead, Washington answered a question Western governments had long avoided. After years of pushing Nato towards confrontation with China, would the transatlantic alliance fight a war it had not chosen together? The answer was no. Iran and Taiwan are different cases. One sits on Europe’s wider periphery and carries....