Xamarin Forms 3.x Compatibilty with .NetStandard 2.0

I am trying to create a xamarin forms app using VS2017 15.7 which by default adds .NETStandard 2.0 and Xamarin.Forms 3.0 to the shared library.
The default solution doesnt event compile. It only works when i downgrade Xamarin.Forms to 2.5.

Is Xamarin.Forms 3.x even compatible to .NetStandard 2.0?