Why now? Trump, Biden and the real reason for Nazanin Zaghari-Ratcliffe's release

The Trump administration insisted on maximum pressure on Iran – the Biden administration has turned that to maximum diplomacy,” said Dr Tobias Borck, research fellow at the Royal United Services Institute, who specialises in Middle East security. ...It is very clear that under a Trump administration, making a deal like this would have been significantly harder for the UK – simply because – you can imagine Trump’s response to us giving this money to Iran. While the Biden administration sees engagement with Iran as largely positive and desirable,” added Borck.