Spying among allies has more impact than you think. There are similar levels of public outrage, but obviously you can't boycot allies without damaging relations

Spying among allies has more impact than you think. There are similar levels of public outrage, but obviously you can't boycot allies without damaging relations more. So measures won't be pubically visual. But it will lead to a degraded confidence and all kinds of cooperation will be reduced and cold shouldering will happen. However subtle and only when a countries own interest is not hurt too much.