Two regional officials told Reuters that the Houthis had met at least twice this year already in Tehran with Russians to discuss anti-ship missiles.
Iran is helping the Houthis try to secure Russian anti-ship missiles, Reuters reported.
These could improve their attacks on ships in the Red Sea and threaten US warships, an expert said.
Two officials said Houthis met Russians twice in Tehran this year, and more meetings are coming.
Iran is helping the Houthi rebels try to secure Russian anti-ship missiles, Reuters reported, citing three Western and regional sources.
Two regional officials aware of the talks said the Houthis and Russians have met at least twice this year in Tehran, where discussions to supply the missiles were underway.
They added that more meetings are expected in the coming weeks.