> Russia on Sunday warned that any country offering its airfields to Ukraine’s air force attacking Russian targets will be considered as having entered the conf

> Russia on Sunday warned that any country offering its airfields to Ukraine’s air force attacking Russian targets will be considered as having entered the conflict, state news agency TASS reported. From the article you linked. If that's accurate, the warning is very narrowly about letting Ukraine fly combat missions from other countries' airfields. They seem to have staked that out as their "OK, do what you like, but go past this line and we'll be big mad" position.