Postcards from Paraguay.

Banging on saucepans.

1. China is resisting a U.S. push to build more-reliable systems for communicating in a crisis, raising the risk that a miscalculation by either side’s military could spill into conflict. Rarely since the Cold War have tensions between two global powers risen to the levels that exist between the U.S. and China today. But unlike the Soviets, who embraced…