Problem: The first Secretary General of NATO has described the purpose of NATO in his famous quote.
In this quote he mentioned several countries, some of which are nowadays Members of NATO. Some of these countries participated in a war in a country that had been before invaded by a non-member country also mentioned by the first Secretary General. What are the names of the current leaders of all countries mentioned in this question? (Keep in mind that some of these countries do not exist today. Name only the leaders of the main successor state.)