You Do Need power plug adapter while traveling from Sint Maarten to Ukraine.

Here is Why You Need An Adapter

The outlet and plug type used in Ukraine are C and F and in Sint Maarten are A and B. This is how they look like.

Sint Maarten

In Sint Maarten, outlets of type A and B are in use.

Type A

Type B

Ukraine

In Ukraine, outlets of type C and F are in use.

Type C

Type F