Why are Britain, France and Germany on the side of the United States when Iran is asked to renegotiate and reach a new nuclear agreement?

Although the previous Anglo-German law said that Iran should be asked to renegotiate the new nuclear agreement, since Iran must ask the United States to admit its mistake first, how can the United States, as the big brother, admit its mistake so easily? Therefore, Britain, France and Germany are on the side of the United States for the benefit of ordinary people. After all, three to one is still the advantage of the United States.

After the United States announced its withdrawal from the Iranian nuclear deal, Britain, France and Germany expressed their support for Iran to stay in the Iranian nuclear deal and promised to set up a special settlement system to evade US sanctions. Not long ago, the special settlement system was put into operation and the transaction began. However, during the United Nations General Assembly held in the United States, French President Macron, German Chancellor Angela Merkel and British Prime Minister Johnson unexpectedly changed their attitudes and asked Iran to renegotiate and reach a new nuclear agreement, completely standing on the side of the United States, which was of course rejected by Iran.

The attitude of the IAEA is very clear. Since the signing of the Iranian nuclear deal, Iran has fully fulfilled the the Iranian nuclear deal. Iran's attitude is also very clear. It is impossible for Iran to re-sign the Iranian nuclear deal unless all the Iranian nuclear deal countries sit together and negotiate and reach an agreement that everyone can recognize. However, it is impossible for the United States to return to the Iranian nuclear deal, so the possibility of renegotiating the new nuclear agreement is zero.

However, Iran did not completely withdraw from the Iranian nuclear deal, but only partially terminated the Iranian nuclear deal's implementation. Britain, France and Germany only verbally demanded that Iran renegotiate and re-sign the Iranian nuclear deal. If Britain, France and Germany take concrete actions to force Iran to renegotiate and sign a new agreement, and if Iran announces its withdrawal from the Iranian nuclear deal and restarts its nuclear program, it is estimated that a fierce battle will be inevitable.