LN has no desire to help Aurvandil. We'd be perfectly happy to help you destroy them.
There is just one thing standing in our way, and that's you, D'Hara. If you would give us peace, we'd clean up LV quite quickly, then join in the war against Aurvandil.
So, no, LN is not the de-facto ally of Aurvandil right now. It's D'Hara, who is doing everything they can to prevent LN from joining the war on the side of the north.
Right. Because D'Hara was totally the one to declare war on you, and because this war totally happened before Aurvandil attacked.
For sure, it's totally D'Hara's fault.