2 June 2012, despite Japan just joining a trilateral military pact with the U.S. and Australia, getting oil from Iran is still of utmost importance to Japanese industries.
So much so that Iran and Japan are developing their own shipping insurance companies, to avoid the U.S./U.K. dominated shipping insurance business, and therefore get around U.S./European sanctions.
The European oil sanctions against Iran go into effect on 1 July. Iran is considering laws that will allow their domestic shipping insurance industry to insure foreign ships.
Japan is now working to create an insurance system that will cover Japanese oil tanker ships carrying Iranian oil. The system might be similar to one created to help Japanese airlines after the 11 September 2001 attacks in the U.S. Prior to that Japanese airlines were insured through U.S. companies, but the U.S. companies drastically cut their coverage after the 11 September attacks.