Here is CodePink's petition to
#StopWar in Ukraine with information for a
#CallToAction, sponsored by the Stop the War Coalition,
Campaign for Nuclear Disarmament, and the No to NATO Network.
Depending on how you feel about any of the multiple demands (which people may or may not agree with so, I won't argue...)
you can sign, or not.
The information is here nonetheless:
https://www.codepink.org/03062022