Philippine President Rodrigo Duterte chided the United States on Wednesday for halting the planned sale of 26,000 rifles to his country, calling those behind the decision "fools" and "monkeys" and indicating he might turn to Russia and China instead.

Duterte's tirades against the former colonial power are routine during his speeches and he said on Wednesday he once believed in Washington, but had since lost respect for the Philippines' biggest ally.

In Washington, U.S. State Department spokesman John Kirby said he regarded Duterte's latest salvo as "inexplicably at odds with the close relationship that we continue to have with not just the Filipino people, but the Filipino government."