Chris Patten said the EU should speak up
EU external affairs commissioner Chris Patten said in an interview with Britain's Guardian newspaper that European governments should speak up before the US went into "unilateralist overdrive".
He said the European policy of "constructive dialogue" with Iran was more likely to bring results than an American approach which consisted of "more rhetoric than substance".
There has been a recent revival of relations between Iran and the West, with the EU hoping that by engaging with Iran, it can encourage the reformers in the Iranian government and improve human rights.
In September last year, EU leaders and Iran discussed proposals for a trade and co-operation agreement in the highest-level meeting between the two sides since the 1979 Islamic revolution
Growing rift
The EU's approach contrasts sharply with that of the United States, which has sought to isolate Iran internationally.
Mr Patten told the newspaper America's policy undermined the EU's efforts towards Iran and North Korea.
"There is more to be said for trying to engage and to draw these societies into the international community than to cut them off," he said.
The EU commissioner questioned whether an "axis of evil" existed at all, saying there was no evidence the three countries were co-operating in developing weapons of mass destruction.
Mr Patten criticised the United States for focusing more on wiping out terrorism than trying to eradicate its causes.
The former British governor to Hong Kong said it was more important to provide assistance for underdeveloped states
"We know... how important it is to handle failed states properly - and to prevent them failing in the first place.
"We have realised that we have to tackle 'the root causes of terrorism and violence', he said, adding that "smart bombs have their place but smart development assistance seems to me even more significant," he said.
Mr Patten's comments come a day after French Prime Minister Lionel Jospin called on the US not to resort to unilateralism or become fixated with the war against terrorism.