"We have always supported negotiations that are purposeful, meaningful and effective," Mottaki said when he was asked if Iran was ready to negotiate Javier Solana, the European Union's foreign policy affairs chief.
Negotiations could be in any fields including the West's wrongdoings such as "expansionism, invasion and occupation," Mottaki said.
Last week, the U.N. Security Council passed a third round of sanctions on Iran ordering assets to be frozen of additional Iranian officials and companies with links to the country's nuclear and missile program.
For the first time, it also banned trade with Iran in some goods that have both civilian and military use.
The U.S., Russia, China, Britain and France, along with Germany, however, also promised an improved package of incentives for Iran to restart negotiations with Solana if uranium enrichment is suspended.
Iran insists its enrichment work is intended to produce fuel for nuclear reactors that would generate electricity and has vowed to push ahead with uranium enrichment.
Mottaki said that the new round of sanctions lacked "technical and legal" justification and would discredit the Security Council.
An IAEA report in February said that while Iran had cooperated in clearing up many of the past questions over its nuclear program, it had not responded properly to intelligence forwarded by the U.S. and its allies purportedly showing nuclear weapons technology.
Iran has dismissed the intelligence as fabricated and insisted the report vindicated its nuclear program and left no justification for any Security Council sanctions.