Such political decisions will also hurt the Europeans' interests, the spokesman said in his weekly press briefing Tuesday.
The EU Monday formally approved an embargo on Iranian oil to be enforced on 1 July.
The EU Foreign Affairs Council made the decision following a review of the EU's restrictive measures against Iran in Luxembourg. It means that the latest package of EU sanctions against the country will apply as decided earlier, and 2 exemptions will end, as scheduled, on 1 July.
This latest package of sanctions against Iran was adopted in January. It banned imports of Iranian Crude Oil and petroleum products, but exempted already concluded contracts, which can still be executed until 1 July.
The sanctions to be adopted by the European Union will negatively affect the upcoming expert-level meetings between Iran and the the P5+1; United States, Britain, China, France, Russia plus Germany in Istanbul, said the spokesman.
The latest round of talks between Iran and the P5+1 ended without an agreement in the Russian capital late Tuesday. But all parties agreed to hold an expert level meeting again in Istanbul in July.
Moreover, Iranian Foreign Minister Ali-Akbar Salehi Tuesday asked EU to be more rational in dealing with Iran as the country has deep experience to thwart a variety of hostile attitudes, including a number of sanctions, against Tehran, the official IRNA news agency reported.
We got used to sanctions as they are not new to us but we hope the European Union will review its unilateral sanctions with more rationality, he told reporters on Cyprus.
Confrontation will be to no one's benefit and there is no reason to take the wrong path, he said, referring to the EU's oil embargo on Iran to be enforced from 1 July.
Mutual understanding is the best option and countries can live in peace while having their own differences, he was quoted as saying by IRNA.
Since Cyprus will undertake the rotating presidency of European Union from 1 July, it is expected that the country will encourage European Union to have close and comprehensive co-operation with Iran through constructive talks, said Salehi.
Iran is ready to remove misunderstandings with the EU, he said, adding Iran is a very important country in the region which plays Key roles in regional developments.
Iran is a good trade partner for Europe and many European countries are satisfied with such relations, IRNA quoted him as saying.
Tuesday, an Iranian lawmaker said that the Uranium enrichment is a domestic achievement, the semi-official ISNA news agency reported.
Hadi Shoushtari, the member of National Security and Foreign Policy Commission of Iran's Majlis (Parliament) told ISNA that the sanctions have no impact on the Iranians wills, especially on the subject of Uranium enrichment.
The Western countries suspect that Iran is developing nuclear bombs under the cover of its nuclear program, while Iran insists on the program's peaceful nature.
The South Korean finance ministry said Tuesday that South Korea will be forced to stop Crude Oil imports from Iran starting next month as the EU will ban insurance on Iranian Crude Oil shipments.
The EU Foreign Affairs Council decided Monday to ban any type of insurance for Iranian Crude Oil shipments from 1 July as planned. The ban will lead South Korea to stop Iranian Crude Oil imports as local shipping firms cannot carry Crude Oil without insurance from Europe.
European insurers are now covering all the protection and indemnity (P&I) insurance on Iranian Crude Oil shipments to South Korea, the ministry said, adding that dependence on European insurers to cover cargo and ships is ranging from 70 to 90%.
The P&I insurance refers to a mutual insurance offered by the P& I Club. The Club is formed among ship owners or ship operators to provide its members with insurance for broader risks such as damage to cargo and sailors that marine insurers are typically loath to cover.
The South Korean finance ministry said the government will work to help minimize the impact from the halt of the Iranian oil imports, adding that it has been making efforts to shun supply shortage by continuously negotiating with other Crude Oil exporting nations such as Qatar, the United Arab Emirates (UAE), Kuwait and Iraq.
South Korea imported 87.18-M bbls of Crude Oil from Iran in Y 2011, + 20.1% from a year earlier. Last year's Crude Oil imports from Iran accounted for 9.4% of the total.