As the F.B.I. has added payback to its portfolio, Republican lawmakers like Senator Charles E. Grassley have emerged as a clearinghouse for leaks and whistle-blowers.

Europe’s dependence on the United States for NATO security limits its options. Its strongest response could be retaliating with its own trade “bazooka.”

Economic instability in Venezuela after the U.S. raid to capture its president is deepening inflation and rattling the currency, sending grocery bills soaring for millions of people.