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Some in NATO, shocked by Mr Trump's threat in January to seize Greenland from Denmark, worry not only that America might sit out a war with Russia, but that it could actively thwart other members' responses. The possibility is seen as remote. But interviews with senior officers and defence officials from several NATO countries reveal for the first time how seriously they take the risk. Some European armed forces are making secret plans to fight not just without America's help, but without much of NATO's command-and-control infrastructure. "The Greenland crisis was a wake-up call," says a Swedish defence official. "We realised we need a Plan B."
