Until recently, we had been led to believe that these issues might be resolved cooperatively and amicably,

It was a civil dispute and it was resolved amicably between parties.

the legal issues have been resolved.

However, it now appears that a cooperative resolution of these issues is quite unlikely and we must move forward with the litigation in order to protect our rights and to get these issues resolved.

We have essential GSM patents for which Nokia is not licensed, and we are disappointed that this has resulted in litigation,

Patent litigation has been amicably resolved and the parties have agreed to dismiss the patent claims.