Arjuna said You are now the best friend of the Kurus. Being related to both parties by thick ties, you are now their friend.
अर्जुन उवाच कुरूणामद्य सर्वेषां भवान् सुहृदनुत्तमः। सम्बन्धी दयितो नित्यमुभयोः पक्षयोरपि॥