Croatia — a member of the E.U. and NATO, and Serbia’s foe during the wars of the 1990s — has criticized the missile purchase as a threat to regional stability.

President Donald Trump said Sunday that NATO faces a "very bad" future if US allies fail to help open the Strait of Hormuz.

NATO has long warned about Russian and Chinese threats across the Arctic and specifically related to Greenland, but is now rejecting President Donald Trump's solution to the problem - U.S. ownership of the strategically-located frozen island - as NATO members claim Trump's actions could end the alliance.

Serbia, a NATO partner and candidate for EU membership, has bought Chinese missiles for its air force.