David Ignatius

U.S. adversaries exploit power gaps. It's easier for Russia to invade Ukraine with irregular forces out of uniform, the so-called 'little green men,' than to send a conventional army that would challenge NATO.

Ronald Reagan, when he was campaigning for President, said that he would break relations with Communist China and re-establish diplomatic relations with Taiwan. But when he got into office, he pursued a very different policy of engagement with China and of increasing trade and business ties with China.