Question

How did the world respond to Bosnian aggression

Answer 1

There was an implicit warning to the Serbs that they would not be allowed to pursue an aggressive course in Bosnia. 
Hope this helps

Answer 2

The UN stopped the flow of weapons to the region, and the U.S. helped to initiate the Dayton Accord. The Dayton Accord did not end the violence, so NATO bombing finally led the way for a NATO peacekeeping force to enter the country.

I hope this helps :)