A relationship on the rocks is never a pretty sight. England’s 307-year union with Scotland is imperiled by a Scottish referendum set for September on seceding from the United Kingdom.

The conventional wisdom on U.S. alliances in Asia, at least in the West, Japan, and Taiwan (but not necessarily in South Korea), is that they are broadly a good thing. One hears this pretty regularly from U.S. officials and the vast network of U.S. think tanks and foundations, such as the Center for Strategic and International Studies and the American Enterprise Institute, and their many doubles in Asia.

The Russian blockade began at midnight on Jan. 29. At factories and warehouses across neighboring Ukraine, truckers had picked up their regular haul of cargo that afternoon and made their way to the eastern border. If their radios were tuned to the news as they drove along the icy highways, they would have heard some alarming bulletins.