Economic damage is not necessarily bad if it’ll hurt your political opponents. Suddenly, the guy who doesn’t have a good grip like Putin has a pretty decent one. In a very short amount of time.
It hurts everyone when 70-75% of all trade happens with NATO+ members - countries that Serbia would directly be in a state of war with if they enter Kosovo and break the Kumanova Agreement.
Even Russia never had that level of dependency on NATO+ trade partners before 2022 or before 2014.