The European Union said it was "concerned" about the disputed presidential elections in Iran and violence following the announcement of President Mahmoud Ahmadinejad's re-election.
"The Presidency is concerned about alleged irregularities during the election process and post-election violence that broke out immediately after the release of the official election results on 13 June 2009," said a statement.
"The Presidency hopes that outcome of the Presidential elections will bring the opportunity to resume the dialogue on nuclear issue and clear up Iranian position in this regard," the statement added.
The EU presidency expected the new government to assume its "responsibility towards international community and respect its international obligations."
Ahmadinejad was yesterday declared winner by a landslide in Iran's hotly disputed presidential vote.
But the result has led to riots in Tehran as opposition supporters took to the streets and clashed with baton-wielding police in unrest not seen since student riots a decade ago.