conjunctions - Why isn’t the pronoun “it” placed after But?

THE SOURCE: NY times

Poland sent soldiers to fight alongside Americans in Iraq, but is nonetheless one of the few countries still hosting North Korean workers over Washington's objections.

Why doesn’t the preposition “it” get placed before "is"? To make it go like this:

But it is nonetheless...

Is it a kind of ellipsis?

Answer

The two verb phrases sent soldiers... and is nonetheless... are conjoined by but and share the subject, Poland; parse it like this:

         sent soldiers ...
 Poland  but

         is nonetheless ...

Compare:

         went to bed 
   John  but
         could not sleep.