Keep your friends close - and your enemies closer. Plus the enemy of my enemy is my friend.
If they buy from us we have sway in updates, spares, software etc - and currently a reasonably stable regime surrounded b6 Syria, Iraq, Iran, Yemen etc where, currently, the West still has an 8nterest in oil supplies.
Or would it be better for us if China takes over as their supplier with J-20s etc and becomes the predominate influence and oil customer?