Reuters | Oil slips away from 2015 highs as doubts emerge over rally Reuters Oil prices have received general support from production cuts led by OPEC and by Russia, which started in January last year and are set to last through 2018, as well as from strong economic growth and financial markets. That has helped tighten markets ... US to be crowned oil king of the world OPEC vs Shale: The Oil Saga Continues Oil at highest since 2015 on inventory drawdown, Iran unrest |