Addressing her final news conference, Power told reporters yesterday that "countries like Russia and China" would benefit from Washington's reduced standing at the United Nations if funding were withdrawn.
"We lead the world, in part, by leading at the UN," said Power, who is stepping down next week after four years as President Barack Obama's ambassador to the United Nations.
"If we were to tie our hands behind our back or strip this organization of programming" to support peace mediation or humanitarian work, "this would be extremely detrimental to US interests," she said.
The United States refrained from using its veto to block the resolution and instead abstained, allowing the measure to pass by a vote of 14-0 in the council, triggering a furious response from Israel.
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Much of Power's parting words were in defence of US engagement at the United Nations, saying that while the "UN system is flawed" with a bloated bureaucracy, there is a need for a global body to pool common efforts.
"The UN goes to places that the US will not go," she added, pointing to peace missions in Mali and South Sudan, where African troops are taking the lead.
"If there's less US leadership at the UN, it will be other countries that step in to fill the void," many of which do not share the US view on fighting terrorism or advancing human rights, she noted.
Power also warned the incoming Trump administration that it would be "very wise" to preserve the Iran nuclear deal that the president-elect has vowed to scrap.
Trump, who will take office on January 20, has dismissed the United Nations as "just a club for people to get together and have a good time.
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