Kerry describes his past relationship with Zarif as professional.
05/11/2021
https://congress.gov...
I know President Biden feels very strongly about living up to our commitments, and our values.
We do not want it to become the hostage of some of these other tensions, all of which are real.
It's a matter of mathematics and physics, not politics, not ideology. It is a response to the science.
Depending on what it involves, shadow diplomacy has also saved us from a war.