Iran has summoned the ambassadors of six countries, including the Netherlands, France, Spain, Italy, Greece and Portugal to protest against new sanctions imposed by the European Union, local media reported on Wednesday.

In January, the European Union foreign ministers formally adopted an "unprecedented" oil embargo against Iran over its nuclear program, banning all new oil contracts with the country.

After a visit to the International Atomic Energy Agency (IAEA) in Vienna earlier this week, the Dutch Minister of Foreign Affairs Uri Rosenthal said the information he received about the situation in Iran was not at all encouraging.

"The only way for Iran to get out of this impasse is to become transparent. It is now up to Iran to show evidence that the nuclear installations only have civil purposes," he said in a press release.