I guess it's safe to say that they say an alliance with Garlemald under current rulership is impossible.

The 6th Legatus and the crew stationed in Gration has all bore witness to Ysayle's transformation into the Primal Shiva and as well as the partnership between dragons.

In either case, in an effort to "help" Hydaelyn the Garleans have -ironically- weakened her: Battle of the Silver Tear Lake, Project meteor which ended up causing the 7th Umbral Era and lastly Ultima Weapon.

Now they're in Azys Lla