Worst Relationships between Heads of Friendly or Allied Countries

[checkers]

I'm not sure if Australia and India can really be considered allies in this period but I remember reading an argument that the reason that they didn't develop a closer relationship was due to the terrible personal relationship between Menzies and Nehru. The article argued that it was prejudice on Menzies part - he resented having the new post-colonial leaders enter what had once been the "white man's club" of the Commonwealth.

Whitlam didn't have a particularly good relationship with Nixon.

This is more political than personal but the Rainbow Warrior incident always seems kind of funny to me given that France and New Zealand are generally allies.