So you know, any players that were eligible to become UFA and were signed prior to July 1st by their respective team has a clause where a team will pay a penalty equivilant to 1 year salary. In your case, trading Kovalav will cost you $5.5M penalty.
Also, Alvaro if it's not too much to ask, could you possibly post an intro article as to your hiring as the Flyers GM. Kind of something for all us fellow GM's to get to know you, etc. I like to think we're a pretty tight knit group...well except for Lone Wold McQuain (see what I did there). He's kind of sneaky, gotta watch out for him!