Arbitration and jurisdiction in foreign purchase order

While placing a foreign purchase order, we keep Arbitration and Jurisdictional laws, in case of dispute.

My queries include

1. Which one should come first, arbitration or approach to court of law.

2. In case of conflicts, say arbitration is as per Indian / Singapore Laws but Courts be Eutopean/ USA, which one to prevail?

Regards,

Jayanta