

Party registration is public data in Arizona. They provide a ton of data, actually. A lot of states just provide name and party affiliation and maybe zip code or whatever. But you can often just buy it.
If they required people to RSVP, it’d probably be pretty easy for a political party to cross reference and check ID. (It seems Arizona sells the list to political parties and mere citizens have the right to inspect the voter rolls. Whatever that means.)
Source: https://www.ncsl.org/elections-and-campaigns/access-to-and-use-of-voter-registration-lists
Is there confusion? From what I’ve read, Ukraine agreed to the partial cease fire and Russia didn’t. Russia was fine with including the terms of the partial cease fire but made absurd additional demands that were essentially a poison pill to force Ukraine to reject the counteroffer. That means there never was a cease fire agreement.