Britain, France and Germany warned Iran on Wednesday that its decision to restart uranium enrichment at 20 percent risked undermining hopes of reviving diplomacy when a new United States administration takes over later in January.
Tehran said earlier this week it was pressing ahead with 20% uranium enrichment at an underground nuclear facility, breaching a 2015 nuclear pact with major powers and possibly complicating efforts by U.S. President-elect Joe Biden to rejoin the deal.
Iran has broken many of the deal's limits on its nuclear activities in response to U.S. President Donald Trump's withdrawal from the deal and the reimposition of U.S. sanctions against Tehran that the deal lifted. Tehran often says it can quickly reverse its breaches if U.S. sanctions are removed.