Foreign Minister Mohammad Javad Zarif said on Facebook the talks with the west were still on despite a U.S. move last week to blacklist Iranian companies, which dodged economic sanctions that remain in effect.
"We are pursuing the negotiations seriously and of course we will give a well-considered, purposeful, smart and proper reaction to any inappropriate and un-constructive move," Zarif wrote.
Zarif also used his posting to send a message to internal critics, Middle East Online said. He said the new blacklisting flap was not unexpected and the negotiations would proceed.
"The negotiating team has a more important responsibility... and is ready to remain silent against unjust and unfair accusations for the sake of national interests, but will answer to all the criticism and ambiguity at the right time," Zarif wrote.
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