The term "close ally" is often used to describe a country or organization that has a strong and dependable relationship with another. There are several synonyms that can be used to convey a similar meaning. "Trusted partner" suggests reliability and faithfulness, while "firm friend" implies a long-standing and unwavering bond. "Confidante" conveys a sense of secrecy and trust, while "comrade" evokes a sense of camaraderie and shared goals. "Supporter" suggests a strong backing and commitment to a cause, and "soul mate" conveys a deep and meaningful connection. Each of these synonyms offers a slightly different shade of meaning but all point to a relationship of closeness and trust.