This is a very smart question on quora, i copy here.
Does UK has true allies?
Averting war with UK Prime Minister Chamberlain in 1938
Are France or Libya true friends or allies?
Gaddafi claims over financing Sarkozy presidential campaign reappear on French TV
Gaddafi was killed by French secret serviceman on orders of Nicolas Sarkozy, sources claim
Are USA and Iraq true allies or friends?
meets Saddām on 19–20 December 1983. Rumsfeld visited again on 24 March 1984
Are America and Osama bin Laden's Al-Qaida true friends or alias?
Are USA and Russia true allies?
A meeting between Roosevelt, Stalin, and Churchill in 1943
On an international level, true allies or friends is just a kind of joke. America has no permanent friends or enemies, only interests
I think the above saying is suitable for every countries in the world.
There are no friends forever, only friends in the period of time.