ally with
Verb
Meaning
unite formally; of interest groups or countries
Source: WordNetSynonyms
Hypernyms
Examples
North Korea faded to black in the early 1990s. With the collapse of the Soviet Union, which had propped up its old Communist ally with cheap fuel oil, North Korea's creakily inefficient economy collapsed. Power stations rusted into ruin.
As a territory, American Samoa has no representation in the U.S. Senate, and we Samoans lost a respected and powerful ally with the passing of Hawaii Sen. Daniel Inouye.