Brazil's health regulator is seeking further data on Russia's Sputnik V coronavirus vaccine before considering its approval for emergency use, Reuters reported.

Documents supporting drugmaker Uniao Quimica's application for emergency use of the vaccine have been returned to the company because they did not meet its minimum criteria, the watchdog said.

In a statement on the health ministry's website, regulator Anvisa said the request failed to provide adequate assurances on Phase III clinical trials and issues related to the manufacture of the vaccine.