US Secretary of State Antony Blinken has alleged that negotiators don’t yet know if Tehran is serious about making a deal in Vienna. The US negotiators are talking with Iran’s negotiators on the sidelines of the meetings of the remaining JCPOA signatories. But perhaps the opposite is true. In spite of severe provocation, Iran did not abandon the talks and has kept its baseline proposition – if the US wants to re-join the JCPOA it must credibly lift sanctions and Iran will scale back its nuclear enrichment to agreed levels. Maybe, by focusing heavily on Iran’s compliance without offering a clear commitment to lifting the sanctions, it is the US that is not serious about the talks.