Regardless of means, attempting to take an ambassador hostage is despicable. The KNF declare unlimited and complete hostility with the Helghast. Hunting them in foreign systems is authorised (with permission from any allied and friendly forces whose territory might be visited) and bounties will be considered (to be announced shortly).
Omni Industries are put on notice that their reputation in Kusari, and in Sirius as a whole, is at risk of collapse pending investigations into an attack on a fellow Liberty company. It may be 'liberty' in some parts of the sector but here in our space you will obey common law. Breaching it by murdering people will get you a life sentence in cold, lonely prison.