The US President Joe Biden on Friday blamed Russian President Vladimir Putin for Alexei Navalny's death and warned there could be consequences, saying he was "not surprised" but "outraged" by the opposition leader's passing.

"We don't know exactly what happened, but there is no doubt that the death of Nalvany was a consequence of something that Putin and his thugs did," Biden said at the White House after Russian prison officials announced that Navalny had died, reports Reuters.

He also said he was "contemplating" additional steps to punish Russia in the aftermath of Navalny's death, paying tribute to the opposition leader for "bravely" standing up to Putin's government's "corruption" and "violence."

"We're contemplating what else can be done," Biden said in response to questions from reporters. "We're looking at a whole number of options, that's all I'll say right now."

Biden also told reporters that there was "no nuclear threat to the people of America or anywhere else in the world with what Russia is doing at the moment," even as Russia considered deploying anti-satellite technology in space. Russia has previously denied the claim.

The White House did not immediately respond to a request for comment on what possible steps against Russia were being evaluated.

US officials were still seeking more information about Navalny's death at a Russian penal colony north of the Arctic Circle, where he was dispatched less than two months ago.

Bd-pratidin English/Lutful Hoque