There is no such things as nation allies.
Who to call allies of US? UK? Israel? Saudi? They are good with US for their own benefit. Look at the old friends Turkey and Philippines.
Power and Money speaks.
USA was powerful with advance military and economy so the world inclined towards it.
Now, Russia and China are competing it.
Look the dilemma in grand old nation Germany. And It's spreading to UK too.
Good point here.All leaders are thinking for their nations best interest.BTW, US is also the same,that is for their own benefit. In war,there is only casualty,deaths,pain,struggles and sacrifices. Its better to be open to any country where you can trade well. Economic prosperity is better than war.