What might be the long term consequences of refusing to help an ally?

Refusing to help an ally can lead to a breakdown of trust and cooperation, diminishing the ally's willingness to support you in future conflicts. It may also embolden adversaries, potentially destabilizing regional or global security dynamics. Over time, this could weaken alliances, reduce collective bargaining power, and diminish a nation's influence on the international stage. Ultimately, the long-term consequences could result in isolation and increased vulnerability to external threats.