Mr Biden conveyed the comment spur of the moment in light of a journalist's inquiry at the White House.
It is whenever he first has utilized such language to denounce President Putin, and the White House later said he was "talking from his heart".
The Kremlin, in any case, said it was "unforgivable manner of speaking".
"We trust such way of talking to be unsatisfactory and unpardonable with respect to the top of an express, whose bombs have killed countless individuals all over the planet," representative Dmitry Peso told Russian state news organization Tass.
The trade in Washington happened Wednesday when a journalist asked the US president: "Mr President, after all that we have seen, would you say you are prepared to call Putin a conflict criminal?"
The President answered "no" prior to being tested, and afterward changed his answer: "Did you find out if I would tell ....? Goodness, I think he is a conflict criminal."
White House Press Secretary Jen Psaki later said the president had been talking from his heart after seeing "uncouth" pictures of the savagery in Ukraine,
instead of making any authority announcement.
She noticed that there was a different lawful interaction, run by the State Department, to decide atrocities - and that was continuous independently.
The president's true Twitter account posted: "Putin is incurring horrifying obliteration and frightfulness for Ukraine - besieging high rises and maternity wards... these are outrages. It is a shock to the world."
Individually, conciliatory extensions between the United States and Russia are being set on fire.
Mr Biden's assertion was an odd one, but not out of saving for a lawmaker history of making amazing strategy shifts in apparently spur of the moment comments (see, for example, his remarks on gay marriage in 2012).
After at first telling a journalist he didn't think Mr Putin was a crook, he returned and switched himself. Assuming there had been an inward discussion at the White House over how to deal with the developing brings in Congress and the press to censure Mr Putin along these lines, the president settled it in an aside, not a set-piece discourse.
This, obviously, will make it harder for Mr Biden and his organization to work with the Russians going ahead. Each concession or arranged understanding, on anything subject, will welcome the reply: How would you be able to connect with a lawbreaker?
Maybe Mr Biden, in his remarks, was essentially recognizing the new reality - that the world's political request has unavoidably moved, and moving ahead is the only real option to the state of affairs.
It came following a bustling day of political auditorium in both the US and Russia over Ukraine.
Ukrainian President Volodymyr Zelensky prior gave a discourse by video connect to the US Congress, getting an overwhelming applause. Hours after the fact, Mr Biden supported extra weapons help for Ukraine, carrying the all out US commitment to $1bn (£760m).
On the opposite side of the world, President Putin likewise gave a broadcast discourse loaded down with against Western manner of speaking.
He blamed the West for attempting to separate Russia with lies, and jumped all over those he called "double crosses" within Russia.
"Obviously they will attempt to wager on the alleged fifth segment, on swindlers - on the individuals who bring in their cash here, yet live around there. Live, not in the geological sense, but rather in the feeling of their considerations, their submissive reasoning," Mr Putin said.
The expression "fifth segment" is frequently utilized for a gathering that attempts to subvert a country or association from within.
"Any individuals, and particularly the Russian public, can continuously recognize the genuine loyalists from the rubbish and the deceivers, and just to let them out like a fly that inadvertently flew into their mouths," Mr Putin said. Such a "self-cleaning" of society would fortify Russia, he added.
Mr Putin additionally blamed the West for attempting to incite common struggle with the objective of "the obliteration of Russia".
His discourse was welcomed with worry by a few Russia-watchers and writers.
Tatiana Stanovaya, a political investigator, told the New York Times that Mr Putin was flagging specialists across Russia to focus on "all circles of society that show any compassion toward the Western lifestyle".
Mikhail Kasparov, a previous Russian Prime Minister who additionally worked in Mr Putin's first government prior to becoming probably his fiercest pundit, tweeted that Mr Putin "is escalating his activities to annihilate Russia".
He is "basically declaring the beginning of mass constraints against the individuals who disagree with the system," Mr Kasparov composed. "This has occurred in our set of experiences previously, and not just our own."
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