The Democratic and Republican presidential contenders have begun defining their approach to major foreign policy issues as they jockey for position in their parties’ primaries.

If 2018 was a year marked by international challenges that percolated but did not boil over into full-blown crises, next year may well be the year in which that good fortune runs out.

Threatening a price hike might work in the short term, but it would come with serious costs to the kingdom’s reputation as a moderating influence on oil markets.

The liberal world order is under threat from its principal architect: the United States.