Here is an even more ambitious one:
Found an EA charter city
Effective Altruism
A place where EAs could live, work, and research for long periods, with an EA school for their children, an EA restaurant, and so on. Houses and a city UBI could be interesting incentives.
Kelsey Piper has written an excellent article on different ways to help Ukrainians, including how to donate directly to the Ukrainian military. But she wisely points out that “[s]uch donations occupy a tricky ethical and even legal area… A safer choice would be to direct money to groups that are providing medical assistance on the ground in Ukraine, like Médecins Sans Frontières or the Ukrainian Red Cross.”