Energy producers have rushed to lock in oil prices since the United States announced its harshest sanctions yet on Russian energy trade on Friday, which sent oil prices surging to multi-month highs, market participants said.

India is now staring at the possibility of an oil shock after the U.S. decided to implement sweeping sanctions on Russia's oil industry.

U.S. and global benchmark crude-oil prices settled Monday at their highest since August as investors focused on the potential supply hit from further tightening of U.S. sanctions on Russia’s oil sector.