US to tighten squeeze on Iran oil
US President Barack Obama has approved the introduction of fresh sanctions on buyers of Iranian oil, BBC reported.
In a statement, Mr Obama said US allies boycotting Iranian oil would not suffer negative consequences because there was enough oil in the world market.
The move would allow the US to take measures against foreign banks that still deal with Iranian oil.
Iran is facing international pressure to address concerns over its nuclear enrichment program.
Western countries suspect Iran of attempting to develop a nuclear weapon. Iran insists the program is purely peaceful.
Mr Obama said in a statement that he would continue to monitor the global market closely to ensure it could handle a reduction of oil purchases from Iran.