In light of the news that kidnapped Estonian security officer Eston Kohver was finally released in a prisoner exchange between Russia and Estonia, I thought I'd pose this question.
Suppose in 2014, when the Russians moved in to capture Kohver, that there would have happened to have been an Estonian military or border guard unit nearby. Suppose then that said unit would have moved in and intervened at the critical moment, resulting in both dead Estonians and dead Russians (Kohver himself may be dead or wounded in this scenario).
What would be the effect of an international incident like this?