A man walks past a signboard of Mitsubishi UFJ Financial Group and MUFG Bank at its headquarters in Tokyo, Japan, April 3, 2018. Photo: Reuters / Toru Hanai.

Japanese banks are moving to stop handling all Iran-related transactions to meet a November deadline set by the United States, after President Donald Trump in May pulled out of a nuclear program agreement with Tehran.

Japan’s biggest bank, Mitsubishi UFJ Financial Group Inc (MUFG) , will halt all Iran transactions to comply with the reimposition of US sanctions against Tehran later this year, according to a document seen by Reuters on Thursday.

The banking unit of Mizuho Financial Group Inc said later on Thursday it would take the same action. Sumitomo Mitsui Banking Corp (SMBC) will carefully consider its response in compliance with the law and based on US sanctions, it said in a statement emailed to Reuters.

The move by MUFG is likely force a halt in Iranian crude oil purchases by Japanese companies as its banking unit handles the bulk of those imports, industry sources have told Reuters.

The bank was fined hundreds of millions of dollars in 2014 for misleading US regulators about its transactions with sanctioned countries including Iran.

“The bank is afraid of US sanctions, so cannot handle trade transactions. Other Japanese banks are likely to be in the same position,” said a Japanese analyst who declined to be identified due to the sensitivity of the issue.

Trump in May withdrew the United States from a multi-party deal on Iran’s nuclear program and ordered the reimposition of US sanctions against Tehran that were suspended under the 2015 agreement.

Washington later told countries to stop buying Iran’s crude oil, that nation’s most important export item, by Nov. 4 or face financial consequences.

Japan is one of the biggest buyers of Iranian crude but the country’s oil refiners have said they may have to stop loading Iranian crude oil from October if they cannot get an exemption from US sanctions to allow imports to continue.

Beyond oil, trade between Japan and Iran is minimal.

MUFG Bank Ltd has informed customers in Japan about its decision, given that dealings with Iranian financial institutions will be prohibited after a 180-day wind-down period, which ends on Nov. 4, the document showed.

MUFG may revise its policy should additional guidance be given by the United States, the bank said in the document.

MUFG did not immediately respond to a request for comment.