President Andrzej Duda indicated that such nuclear-sharing as NATO's largest eastern European member, and which is just off Russia's doorstep, is now an "open" topic for discussion.

Crucially for the question of continued nuclear saber-rattling and confrontation with Russia, if Poland ever did host US-NATO nukes it would mark a huge first for a NATO member that was once behind the Iron Curtain.

"The problem, first of all, is that we don't have nuclear weapons," President Duda told Gazeta Polska newspaper in statements published Wednesday. "There is always a potential opportunity to participate in nuclear sharing."

He was quick to clarify, however, that under such a nuclear-sharing program "this would not be a nuclear weapon under the control of Poland. Participation in nuclear sharing does not imply having your own nuclear weapon."