The proof of this goodwill can be tested and revealed to be true or false.

Everyone knows that the US outsourced the Iraq war to NATO.
Now, as a seriously interested party in this war, NATO now proposes:

http://news.xinhuanet.com/english/2015-07/31/c_134469093.htm

The value and worth of what NATO is proposing here can be evaluated. If the monthly massacres of 1300+ Iraqis ends and the 2000+ monthly wounded Iraqis stops, then we all definitely owe this proclamation to NATO:

BRAVO!

However, if the combined morbidity numbers remain the same then we know that this NATO's gesture is outright bullshit.