US President Donald Trump has warned he'll soon increase sanctions on Iran 'substantially'.
He's also accused Tehran of secretly enriching uranium for years.
Earlier this week Tehran announced it would be exceeding the limit on uranium enrichment set out under the 2015 nuclear deal, which the US pulled out of last year.
France has stepped in to reduce regional tensions as Iran puts pressure on European countries to back it, as US sanctions bite.
Al Jazeera's Zein Basravi reports from Tehran.
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