Iran's chief nuclear negotiator Saeed Jalili said Thursday that the West should not make any miscalculations in the upcoming nuclear talks in Baghdad.

Iran will attend the next round of nuclear talks with dignity and will defend its nuclear rights, Jalili said when addressing a conference in Tehran dubbed "Economy of Resistance."

He warned some members of the P5+1, namely the United States, Britain, France, China and Russia plus Germany, to be careful about their remarks ahead of the nuclear talks slated for May 23 in the Iraqi capital, and do not make any miscalculations about Iran, implying that the Islamic republic will insist on its nuclear rights based on Non-Proliferation Treaty (NPT).

The world powers have spearheaded diplomatic efforts to persuade Iran to rein in its nuclear program, which Iran says is purely peaceful but the United Nations and Western leaders suspect of its military purposes.

One of the West's big mistakes about Iran, since the Islamic revolution in 1979, was that "they have made miscalculations several times," said Jalili, who is also Iran's Supreme National Security Council (SNSC) Secretary.

Iran is ready for talks with the P5+1 for cooperation based on Iran's inalienable nuclear rights, the nuclear negotiator stressed.

As for some members of P5+1 have said that the time for talks over Iran's nuclear issue is about to terminate, the official responded, saying: "I say that, today, the time for pressure strategy (on Iran) is over."

On Thursday, the Jerusalem Post reported that the U.S. Ambassador to Israel Dan Shapiro said his nation's military has completed necessary preparations to launch an attack on Iran's nuclear facilities in the event that international sanctions and diplomacy fail.

"It would be preferable to resolve this (the Iranian nuclear crisis) diplomatically and through the use of pressure than to use military force, but that doesn't mean that option is not fully available. Not just available, but ready. The necessary planning has been done to ensure that it's ready," Shapiro told a closed lawyers' conference in Tel Aviv earlier this week.

"We do not know if sanctions and diplomacy will work, so all options are on the table, including the military option," Shapiro said.

The ambassador underscored that U.S. President Barack Obama had previously clarified -- in meetings with Israeli leaders and public pronouncements -- that the United States will do whatever is necessary to prevent Iran from acquiring nuclear weapons.

"I think this is a statement that America can take to the bank, that Israel can take to the bank, and that Iran should take to the bank," Shapiro said.

Pressures on Iran will further enhance Iranians' resistance and progress, Jalili said Thursday, maintaining that "Today, the path that the Iranians have chosen for their progress is irreversible and they (the West) have not been able to achieve their objectives via pressures."

The official IRNA news agency reported Wednesday that an Iranian deputy foreign minister asked the world powers to recognize the "legitimate rights" of his country to pursue " peaceful nuclear technology."

Iran will respond to the West in a positive manner in the upcoming nuclear talks if the latter continue talks in a realistic atmosphere, said Hossein Amir Abdollahian, Iranian deputy foreign minister for Arab and African Affairs.

Abdollahian expressed hope that the upcoming nuclear talks between Iran and the P5+1 in Baghdad will be a step forward.

Israel, Western leaders and the UN nuclear watchdog believe that Iran, which has repeatedly threatened to destroy the Jewish state, is clandestinely trying to build a nuclear weapon under the ruse of medical research and power generation. Iran has rejected the claims, insisting that its nuclear program is just for civilian purposes.

On the other hand, the Kremlin said on Thursday that Russia will work to exclude Syria and Iran from the declaration of the upcoming Group of Eight summit.

The situations in Syria and Iran will be discussed on the sidelines of the summit, and Russia will maintain its principles and avoid the inclusion of articles concerning the two countries in the declaration of the summit, Presidential aide Arkady Dvorkovich said.

"We believe the main floor to solve these issues, to make agreed positions is the UN Security Council. During the G-8 summit these topics could be discussed informally," Dvorkovich said.