Sort of like American capitalists providing Russian communists with oil, food, trucks and weaponry during WWII. Believe it or not, India attacked Pakistan in Bangladesh's (East Pakistan, a majority Muslim region of Pakistan, at the time) behalf and provided Bangladesh with weaponry during its successful secession effort from Pakistan.
My mind goes back to the partition of India with Lord Mountbatten at the helm and the huge slaughters that took place between the two religious groups. I would think they’re still mortal enemies.