Cash became king in global markets on Tuesday as an escalation in the Middle East conflict dragged down gold, bonds and stocks synchronously, upending the normal interplay between safe and riskier assets and driving up volatility. The turnaround in market sentiment, which just a day earlier was premised on a swift end to the conflict, came as Israel attacked Lebanon, and Iran responded with strikes against energy infrastructure in Gulf countries and tankers in the Strait of Hormuz,...