TEHRAN (Reuters) - The European Union is not doing enough to preserve the benefits for Iran from the 2015 international nuclear pact following the withdrawal of the United States, Iran’s foreign minister told the EU’s energy chief on Sunday.

Miguel Arias Canete, European Commissioner for energy and climate, said Tehran wanted the 28-nation bloc to act fast to preserve its oil trade with Iran, and to consider making direct euro-denominated payments for Iranian oil to Iran’s central bank, bypassing the U.S. financial system.

“With the withdrawal of America .... the European political support for the accord is not sufficient,” Mohammad Javad Zarif told Arias Canete in Tehran, Iran’s state news agency IRNA reported.

Since President Donald Trump announced on May 8 that he would pull the United States out of the deal, the U.S. Treasury said Washington would reimpose a wide array of Iran-related sanctions after the expiry of 90- and 180-day wind-down periods, including sanctions aimed at Iran’s oil sector and transactions with its central bank.

The EU leaders have pledged to try to keep Iran’s oil trade and investment flowing, but conceded that would not be easy.

“We have to preserve this agreement so we don’t have to negotiate a new agreement,” Arias Canete told Western journalists after two days of meetings with Iranian officials in Tehran.

“Our message is very clear. This is a nuclear agreement that works.”

Under the deal, Tehran agreed to curb its nuclear work in return for the lifting of most Western sanctions. With the threat of new U.S. sanctions looming over them, some foreign firms have already started signaling their intention to pull back from Iran.

“The announcement of the possible withdrawal by major European companies from their cooperation with Iran is not consistent with the European Union’s commitment to implementing (the nuclear deal),” Zarif was quoted as saying.

Iranian Foreign Minister Mohammad Javad Zarif meets with European Commissioner for Energy and Climate, Miguel Arias Canete, in Tehran, Iran May 20, 2018. REUTERS/Alissa de Carbonnel

He appeared to be referring to announcements by several large European companies last week suggesting their activities in Iran would end or be curtailed because of the reimposition of U.S. sanctions.

A top adviser to Supreme Leader Ayatollah Ali Khamenei on Sunday cast doubt on whether European nations could be trusted to save the agreement.

“The contradictions in the words of European authorities are suspicious. We hope that our government officials will be able to secure the necessary guarantees in their negotiations, as one cannot rely on those who vacillate and speak contradictory words,” IRNA quoted Ali Akbar Velayati as saying.

OIL TRADE

Following the withdrawal of Washington, Iran said it would remain in the deal only if Tehran achieved its goals - namely being protected from sanctions on key sectors of its economy such as oil - in cooperation with other signatories of the pact.

EU investment in Iran, mainly from Germany, France and Italy, has jumped to more than 20 billion euros since the lifting of sanctions in 2016, in projects ranging from aerospace to energy.

But to improve its oil-reliant economy, Tehran needs to attract $100 billion in foreign investment to boost its oil industry and major western investors have stayed away from Iran, partly because of the remaining U.S. sanctions on Iran.

“The announcement, in cascade, of European companies that will not keep investing in Iran are making the things much more complicated at the moment,” Arias Canete said.

“So what he (Zarif) is asking the European Union is that we have to have concrete solutions in order to implement the European Union commitments, which is something that we fully recognize.”

The options being considered by the EU to keep Tehran in the nuclear deal include new credit lines for Tehran, increased energy cooperation and implementing EU laws to block European companies from caving in to U.S. sanctions.

Arias Canete said Iranian officials were keen to mitigate the impact of U.S. sanctions under a proposal for EU governments to make direct euro-denominated payments for Iranian oil to Iran’s central bank, bypassing the U.S. financial system.

“The EU will consider it,” he said, adding that the EU needed to deliver fast on preserving oil trade with Iran.