Iran parliament speaker Ali Larijani Tuesday slammed plans by the United States to beef up defences in the Gulf against potential Iranian missile attacks, insisting the Islamic republic is no threat to its neighbours. "America's new puppet show for protecting and implementing security in the region is nothing but a new political trick to pave the way for its presence at others' expense," Larijani said in comments to the house carried by the state broadcaster. "American officials do not realise that they are the problems in the region. The more equipment you bring in, the more it worries the countries where they are deployed," he added. "Has Iran ever committed any aggression against any neighbours or the region?" he asked.