Russian President Vladimir Putin warned on Thursday that ISIS militants have taken 700 hostages in Syria and he claimed the terror group has pledged to murder 10 people a day if their conditions are not met.

Putin made the disturbing claim while speaking at a forum in Sochi — adding that several US and European nationals are among those captured.

“They have issued ultimatums, specific demands and warned that if these ultimatums are not met they will execute 10 people every day,” Putin said.

There was skepticism about Putin’s claims in Washington, where a senior US official told Fox News the information was “fake news.”

“We have no information supporting the large number of hostages alleged by President Putin and we are skeptical of its accuracy,” a Pentagon spokesman said.