One universal domain or many local ones?

Question

Search Engine Optimization

Is there an advantage in terms of search engine optimization like this:
site.com/ru
site.com/es
site.com/de
over this:
site.ru
site.es
sire.de
?
Is it possible to install a different PWA for each site.com/xx?

Answer 1

I don’t know how you can set up one engine, I didn’t look, but at least you can put each engine on the language and PWA to it))

Answer 2

In the first option, the domain trust will affect regional pages and it will be easier to make changes.
About the second: it seems that separate domains are better for promotion and less risky for sanctions, you can experiment more, but also link building work, etc. 2 times more.