Indeed, if independent of Spain, she is too weak not to be under the control of the power that rules the sea and so has readiest access to her.

Louis continued to support her against Spain, and secured her independence.

He also interfered with the Dutch, and compelled them to restore Brazil, which they had taken from the Portuguese.
On the other hand, Louis obtained from Charles II.

the cession of Dunkirk on the Channel, which had been seized and used by Cromwell.
This surrender was made for money, and was inexcusable from the maritime point of view.

Dunkirk was for the English a bridge-head into France.