Former U.S. spy agency contractor Edward Snowden on Tuesday doubted the veracity of reports of Russia's alleged "invasion" of Ukraine and suggested that statements without evidence could provoke an escalation of the crisis.

"So... if nobody shows up for the invasion Biden scheduled for tomorrow morning at 3 a.m., I'm not saying your journalistic credibility was instrumentalized as part of one of those disinformation campaigns you like to write about, but you should at least consider the possibility," the whistleblower said.