DUBAI (Reuters) - The United Arab Emirates, a Gulf energy producer, said on Monday that instability in Iran was not in the regions best interests and described foreign interference there as unacceptable. Iran has accused Britain and the United States of interfering to provoke street protests against the re-election last week of its hardline president, Mahmoud Ahmadinejad. We believe that interference from any party in Iran is unacceptable, UAE Foreign Minister Sheikh Abdullah bin Zayed al-Nahayan said in comments made in Turkey and carried by Al Jazeera television. The UAE was one of the first countries to congratulate President Ahmadinejad. All countries in the region are in the same boat in believing that its not in the interests of any country to be exposed to instability. Meanwhile, foreign powers urged citizens to avoid travel to violence-wracked Iran Monday as Tehran focused its anger on London, but European leaders closed ranks against accusations of meddling. Britain, Italy and later Germany all warned its nationals against non-essential travel to Iran, with London also pulling out embassy staff family members after radical students threatened its premises in Tehran. Iranian lawmakers urged a review of ties with Britain as radicals labelled its government perverted and warned that Tuesday could be another November 4, the date when some students captured the US embassy in Tehran after the 1979 revolution. Irans wrath and accusations of meddling in the post-election protests led the European Union to declare Tehrans accusations baseless and unacceptable. The Czech EU presidency summoned the Iranian charge daffaires in Prague and categorically rejected Irans claim that positions expressed by the EU and its member states constitute illegitimate interference in Irans internal affairs. Warnings against non-essential travel to Iran came after riot police armed with clubs fired tear gas on Monday at about 1,000 opposition protesters who defied an official ban on demonstrations. There have been violent clashes at and after some demonstrations with some deaths. Further violence is possible, the British Foreign Office said. Germany said it invited Irans ambassador to clarify the charges of interference, which Berlin found disconcerting, a foreign ministry spokesman said. The day before Chancellor Angela Merkel had called for a recount in the June 12 election that returned hardline President Mahmoud Ahmadinejad to power, triggering mass opposition protests and charges of vote fraud. The post-election protests are the biggest popular upheaval in Iran since the 1979 Islamic revolution. Foreign media have beem restricted in reporting on the crisis but images of police brutality have spread worldwide via amateur video over the Internet. The top diplomat for Sweden, which takes over the rotating EU presidency on July 1, urged Tehran to allow its citizens the right to peaceful protests, which he said was protected in the Iranian constitution. Certainly the use of lethal violence against peaceful demonstrators is never tolerated in any country, said Swedish Foreign Minister Carl Bildt. Canadian Prime Minister Stephen Harper on Monday called on Iran to halt its assault on press freedoms and release all political prisoners and journalists. And in reply to charges of meddling, US President Barack Obamas fellow Democrats say he has rightly taken a hands-off approach, with officials insisting there are no US fingerprints on the unrest. Moscow on Monday called for a constitutional resolution to Irans post-election standoff, while emphasising good neighbourly relations with Tehran. The divergences that have appeared following the election must be resolved in strict conformity with the constitution and the law, Russias foreign ministry said in a statement. Irans neighbour, Syria, clearly defended the Iranian election and turned its criticism on the masses who have taken to the streets. Syrian Foreign Minister Walid Muallem on Monday criticised the street protests that have rocked Tehran over the disputed presidential election, saying the Iran regime will not fall. The Iranian people have exercised their right to vote, he said of the June 12 poll that returned President Mahmoud Ahmadinejad power in what official results said was a landslide. Meanwhile, the exiled son of the late shah of Iran, Reza Pahlavi, warned Monday of dire consequences for the volatile Middle East and the rest of the world if the popular uprising in Iran is crushed. The defeat of the movement protesting the outcome of presidential elections 10 days ago would not only threaten global stability but could lead to nuclear war, Pahlavi told a news conference. Their defeat will encourage extremism from the shores of the Levant to the energy jugular of the world, said Pahlavi, who left Iran a year before the ouster of his father, Mohammad Reza Pahlavi, in the 1979 Islamic revolution. At worst, fanatical tyrants who know that the future is against them may end their present course on their terms: a nuclear holocaust, Pahlavi told a room packed with reporters at the Nat-ional Press Club in Washington.