Turkey’s geography and membership in NATO have long given the country an influential voice in foreign policy, but the assertive policies of President Erdogan have complicated its role.

China’s recent push to renew the Six Party Talks, stalled since 2008, has raised hopes for progress on the peninsula despite worries that Pyongyang may have restarted its old nuclear reactor.

The dollar’s role as the primary reserve currency for the global economy allows the United States to borrow money more easily and impose painful financial sanctions. Other countries are beginning to …