Paulo Costa responds to Bogdan Guskov's callout

Brazilian middleweight Paulo Costa has publicly responded to a callout from Russian fighter Bogdan Guskov. The post does not specify the nature or content of Costa's response. Guskov has been actively seeking high-profile matchups in the UFC middleweight division. No further details about a potential bout or Costa's exact comments are provided. The interaction suggests ongoing negotiations or public interest in this potential matchup.