The original tweet has been deleted and I've seen no further media corroboration in the last 3h so it's looking likely that "officially declares war" was some kind of misinterpretation or exaggeration.

The original tweet has been deleted and I've seen no further media corroboration in the last 3h so it's looking likely that "officially declares war" was some kind of misinterpretation or exaggeration.

https://warpcast.com/vitalik.eth/0x248198

Good to hear. 

Also, Yemen has been in a Civil War for almost a decade, so the issue of which regime legitimately speaks on behalf of the nation-state here may not be so easy.