In need of desperate help Rowan tree disease


So 2 years ago i have got myself a Sorbus Likjornaja a type of Rowan tree, very very very hard to come by in my area. For those 2 years it gre splendit with absolute no worry or issues. But this year for the last week more exactly it started to dry out and im afraid of not to lose it. As i am not sure what is happening here if its a dissease or anythng else i need a bit of help from anyone who knows about Rowan Trees

Here are some pictures:

As you can see it started to dry out

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