The president may seek a showdown he can win at a time when a conflict between great powers seems more likely than it has for a generation.
States such as Saudi Arabia, Russia and China are showing a brazen disregard for the rules-based international order.
It caused anger and unease across the West, but the meeting between the Russian president and Donald Trump was not as substantively “historic” as its protagonists may have hoped.
The pantomime is in full swing, but no one knows the end of the script.
The West has still not reckoned with its first mistake in Syria: demanding the removal of Assad.
After the Salisbury poisoning, Britain could rely on the unanimous support of France, Germany and the US in condemning the attack
Nixon also allegedly played up his unpredictability in the Cold War, with the US embroiled in Vietnam.
With China, India and Russia on the rise and Western confidence shaken, how should Britain navigate this new and dangerous world?
Merkel may find it hard to stomach Trump but she will not be wishing away US military power from Europe with any relish.
Policy-making decisions must have their wider social, as well as economic, impact taken into account.
From the Middle East to North Korea, Donald Trump is reasserting US military strength and intensifying the rivalry among the great powers.
Tyler Cowen argues that Americans used their new-found wealth and prestige “to dig in”, protect themselves against risk, “and to build and cement a much safer and static culture”.