In WW2 Stalin initially made a pact with Hitler while all the while knowing Hitler would violate it and invade anyway. Stalin just used it to buy time to ramp up the Soviet military. From what I recall it's likely Hitler assumed this as well and used the pact to delay dealing with the Soviets militarily and focus on his Western front to snatch up as much of Europe as possible.
Obviously a very dramatic example but as it applies here there's a very good chance that even if a competitor seems helpful, etc at first they could very well leverage the entire scenario to their advantage eventually (somehow).