[quote=@Skepic]
Well, with certain something that may or may not happen between Avalia and Tin that me and Cyclone may or may not have worked out... Let's just say some fighting might start very soon.... maybe... possibly... potentially... 

Hint hint, Avalia not to long ago cut off all trade relations with Tin, sending them literally nothing. 
[/quote]Yup, that's more likely to get things going.
At first Yllendthyr would be neutral and only assist in offering alternative trade routes without touching Tin territory.
If it comes to actual war they would likely offer an alliance and may propose plans for a two pronged attack.