While “buy from EU” sounds reasonable (and it is, in terms of physical goods that shouldnt rely on huge travels around the world), it is dangerously intertwined with protectionism.
Politicians really like the idea of protectionism, but it doesnt help in terms of software, which is a big topic in here.
Open Source / Free Software is always global, doesnt discriminate against contributors from any country (may it be sanctioned or not).
I know a lot of really shitty proprietary software from the EU that I would always trade for free software from a global community.
But there are normal people living there and also companies doing open source. Linux would be in a way worse state without Redhat for example
It doesn’t change the fact that if you buy their products, the government still profits from it through taxes.
I dont think that counts for donations though