Does this demonstrate failed US policies or does it show allies can and do change with the times?
England was prime factor in the foundation of the US, we rebelled and England became our enemy. Fast forward to WWI and WWII, England was our ally. So can it be said that the US was inconsistent with its foreign policy?
How about the alliance with the USSR during WWII? We shipped supplies to aid in the war against Germany, only to once again become enemies at the conclusion of the war. Did the US build up Soviet Russia in order to have someone to decry at a later date?
Foreign policy is an inexact science. Perhaps one has ally with a demon to fight the devil. If I am being mugged on a street by a gang, and the only help available is from someone I suspect will rob me at a later date, I would except the help. Foolish? Perhaps but I would deal with the possibility of being robbed at a later date... I know I am going to be robbed now if the situation does not change.