Prof Dr. R.Aldous (Hd of History, UC Dublin), Macmillan, Eisenhower and the Cold War, 4 Courts Press, 2005 gives archive attribution for these:
U-2, May,1960: (P.150:) 'Encouraged by his old friend (Mac) to humiliate himself (by apologising to Khrushchev, Ike reflected) on de Gaulle's loyal promise that 'whatever happens, I want you to know that I am with you to the end'. (CDG) was a difficult and irritating partner but in a real crisis, his support was unquestioned.'
Cuba,1962: (P.197: ) Dean Acheson was told by CDG 'to tell your president that France supports him unreservedly. [...]We are beside you'.