The United States has stepped up pressure on Tehran by announcing an end to the waivers that have allowed major oil importing nations to buy from Iran, in a move that raises questions about the ability of other oil producers to fill the gap.

As a result Brent crude, the international oil price benchmark, has risen above $74 a barrel for the first time in six months.

Here's a look at some of the most pressing questions.

Already have an account? Log In

Thanks for reading Hart Energy.

Subscribe now to get unmatched coverage of the oil and gas industry’s entire landscape.

Get Access