I'd hate to say it, but including other political ideologies into the software license is making it more political. If the author of the software wants to, he is within his rights, but i think it's the wrong platform to try to voice his opinion.
A piece of software is a platform - but using this platform (granted to the author by the participation of a community) to further a different, unrelated ideology could be considered abuse of power. May be this war is extenuating circumstances - and understandable. But i'm concerned about the slippery slope.
Realistically a license change is not going to affect the course of the war, nor make putin reconsider. I argue that the effort is only going to inconvenience their users, without actually making a true change.
It may be better to ask for donations, etc, rather than changing the license as a political statement.