The comment from Ahmadinejad came as Iran is negotiating with the West over a U.N.-backed proposal to ship its uranium abroad for further enrichment. The UN-brokered plan would require Iran to send 1.2 tons (or 1,100 kilograms) of low-enriched uranium - around 70 percent of its stockpile - to Russia in one batch by year's end, for processing to create more refined fuel for a Tehran research reactor.

"While enemies have used all their capacities ... the Iranian nation is standing powerfully and they are like a mosquito," a government Web site quoted Ahmadinejad early Sunday as saying.

Ahmadinejad also said Iran doesn't trust the West when it sits for talks. "Given the negative record of Western powers, the Iranian government ... looks at the talks with no trust. But realities dictate to them to interact with the Iranian nation," he said according to the site.

The U.S. and its allies have been pushing for the U.N.-backed agreement as a way to reduce Iran's stockpile of low-enriched uranium to prevent the possibility that Iran may turn them into weapons-grade uranium, materials needed for the core of a nuclear bomb.

Iranian opposition to the U.N. plan could be driven by concerns that the proposal would weaken Iran's control over its stockpiles of nuclear fuel and could be perceived as a concession to the West.