TOKYO (Reuters)—Japan's lower house passed a bill on Friday to provide government guarantees on insurance for Iranian crude cargoes, a key step toward it becoming the first of Iran's big Asian oil buyers to get around new European Union sanctions.

The bill will now be sent to the upper house, where opposition parties have the majority but have signaled their support. It will become law by around June 27 if passed before the current parliamentary session ends next Thursday, said a government official who requested anonymity.

The Japanese government, which has succeeded in getting a waiver from U.S. financial sanctions, wants to provide coverage of up to $7.6 billion for each tanker carrying Iranian crude bound for Japan in the event of accidents.

An E.U. ban on member countries importing Iranian oil takes effect on July 1 and includes a ban on E.U. insurance firms from covering Iran's exports. That is a headache for Japan, South Korea, China and India, which together buy two thirds of Iran's oil exports and rely on E.U. companies to insure them.

E.U. and U.S. sanctions aim to cut the oil revenues on which Tehran depends to force the Islamic Republic to curb its nuclear program. The West suspects Iran aims to develop weapons, while Tehran says it needs reactors for electricity supplies.

Iranian oil accounted for nearly 9% of Japan's crude imports last year. Japan has reduced the flow already to comply with U.S. sanctions requiring buyers to make sizeable cuts, but wants to avoid more drastic reductions that may drive up energy import costs and hurt the world's third-largest economy.

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Refiners cut their purchases even as the country has needed more oil to fire power stations after last year's Fukushima disaster shut down the country's nuclear power capacity.

India's government, which won an exemption to U.S. sanctions this week, has also been trying to figure out how it will get around the E.U. sanctions.

"We are struggling to find solutions," Oil Minister S. Jaipal Reddy told reporters in Vienna, where crude producers from OPEC are meeting. The government was studying sovereign guarantees, he added.

Iran's top buyer China has yet to detail how it plans to resolve the insurance problem, but industry sources there have said they will find a way to keep imports flowing.

South Korea will reduce imports to zero in July due to the insurance ban, industry sources have said. Seoul, like Tokyo, has lobbied the E.U. to delay or get a waiver on implementing the ban on insurers, but is not considering state guarantees, according to government sources there.

Those lobbying efforts have so far failed. The European Union will not cancel or delay the embargo on Iranian oil tankers, E.U. Energy Commissioner Guenther Oettinger said at an industry conference on Wednesday.

The International Energy Agency said on Tuesday that Iran's crude exports in April and May have fallen by 1 million bpd since the end of 2011 to 1.5 million bpd and that Tehran may need to shut in production.

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China, Japan, India and South Korea have cut purchases by about a fifth from the 1.45 million bpd they were buying a year ago ahead of the imposition of the sanctions.

It is the first time Japan has sought to provide guarantees on marine shipments, said an official in the country's transport ministry, which is sponsoring the legislation. The official, who helped draft the bill, said he didn't know when the law will be passed by parliament.