"partner is being sued for broadcasting content they are not...

"partner is being sued for broadcasting content they are not entitled to and they have failed to pay royalties"

I think you mean "for allegedly broadcasting" and "have allegedly failed to pay".
There is so little information here!

"Sony and Eurosport representatives hope to solve the issue peacefully,..."

" ...through the courts trying to sue the Ukrainian video service DIVAN.TV" "Trying to sue"????
"...while Fox History and claims more than one year are considered in the Ukrainian courts." What does that even mean?
So yes, at the moment I think it isn't too serious.