Richardson made the comments at the Atlantic Council on Thursday.
"If I talk to my number two adversary in the region, Russia, I mean, I've got of course the countries Cuba, Venezuela and Nicaragua with Russia relationships," Richardson said.
"But what I really look at, in six other countries by the way, so total of nine, have Russian equipment in them and we're working to replace that Russian equipment with the United States equipment if those countries want to donate it to Ukraine or the cause that's happening and be able to replace that with with US equipment."
“As a matter of protocol, we are not going to discuss details about the defense resources of sovereign nations or speculate about any support to Ukraine they have not already announced,” SOUTHCOM spokesperson Jose Ruiz said in response to a query by VOA on Friday.
“Insofar as offering our defense partners opportunities to purchase or receive U.S. defense equipment, we offer what we consider to be a better alternative. U.S. defense equipment is superior in both its proven reliability and the level of sustainment support it receives during its operational life” Ruiz added.
Argentina, Colombia, Ecuador, Mexico and Peru all have versions of the Russian Mi-17 transport helicopter sought after by Ukraine.
“The United States would probably have to offer the correct incentives for these countries to transfer their weapons, be it cash, some sort of security arrangements or promises to backfill with weapons” Reseach analyst Ryan Brobst told VOA. “This is an opportunity for the United States to peel away these countries from reliance on Russian weapon systems.”