Russia is now under an elevated state of nuclear readiness in response to unexpectedly strong Ukrainian resistance and an overwhelming global outcry against President Vladimir Putin’s invasion of his sovereign neighbor. Putin no doubt thought this invasion would yield a quick ouster of Ukraine’s leadership so he could install a Moscow-friendly government. Instead, he is resorting to acts of desperation to mask his embarrassment. The invasion itself was the work of a madman, so it’s anyone’s guess what Putin might do next to protect his self-cultivated image as a steely eyed strongman. Still, P...