Politics are often paradoxical, no more so than in the Middle East. Iran's President Hassan Rouhani has just cast doubt on one of his greatest foreign policy successes. But one must assume that Rouhani does not actually wish to cancel the international nuclear deal that was reached in 2015. His threat of backing out of the agreement if the US imposed further sanctions can be seen as a cry for help - not to let things get out of hand.

The nuclear deal, of course, has many opponents in Washington, Tel Aviv, Riyadh and Tehran, as well. Iranian opponents of the deal are mobilizing - all the more so since Rouhani won a landslide re-election victory in May. The conservative establishment, led by the powerful Supreme Leader of Iran Ayatollah Ali Khamenei, has done everything it can since then to limit Rouhani's power and torpedo Iran's opening to the West, something desired by the president and the majority of the population. Hassan Rouhani invested significant political capital in rapprochement with the West and the nuclear deal. Now he is confronted with the fact that Iran is being denied its share in the deal by a government in Washington that has set a confrontational course with Tehran by imposing new sanctions, overtly looking for ways of letting the entire nuclear deal fall through, and openly speaking of regime change in Tehran.

US sanctions affect EU businesses

The US sanctions policy has also caused European companies to exercise caution with business commitments in Iran, as such dealings can lead to penalties from Washington. This is especially true for banks and financial institutions. Without their help, however, trade cannot gain any momentum because of problematic financing. Ultimately, European companies are not regulated in Brussels, but instead, in Washington, and Iran's integration into the world economy can fall by the wayside.

Washington's aggressive rhetoric strengthens the hawks in Tehran, and Rouhani must take this into account. Just last Sunday, parliament increased the budget for the country's missile program and the Revolutionary Guard Corps. And of course, Iranian leaders are watching North Korea. Kim Jong-un is using the threat of nuclear weapons to ensure the survival of his regime - all the more so when international pressure mounts on him. And he has been successful, so far. Tehran may now be wishing it had some of its nuclear options back on the table.

The nuclear deal has made the world safer

One thing is certain: The deal is working. The International Atomic Energy Agency (IAEA) has now approved six Iranian reports on compliance with the Joint Comprehensive Plan of Action (JCPOA). Iran is much further away from creating nuclear weapons than it was three years ago. The world has become much safer. However, one cannot expect the nuclear deal to attain goals that it was not created for, including Iran's good conduct in other political issues like Syria, Iraq and Lebanon.

It is nonetheless becoming more important for Europeans to continue their support for the nuclear deal and also back the moderate political forces in Iran in general, just as the European Union did 10 days ago when the bloc's foreign policy chief, Federica Mogherini, flew to Tehran for Rouhani's inauguration.