Why Tillerson's exit could shake oil markets

Rex Tillerson and Mike Pompeo. Photo: Joseph Eid, Jim Watson AFP/Getty Images

A number of analysts quickly predicted that Secretary of State Rex Tillerson's ouster and Mike Pompeo's ascendance will ensure a more aggressive U.S. posture against two major oil producers: Iran and Venezuela.

Why it matters: Beyond the security and humanitarian considerations, potential new sanctions could also alter oil markets.