Victims who responded to the Facebook advertisements were contacted by Russian-speaking callers posing as investment advisors.

From the articleCrypto scammers stole millions from Russian speakers, Brooklyn just hit their serversAlso in A Crypto Scam in Brooklyn Hit Its Victims Twice. Seized Server Data Shows How, Brooklyn crypto scam bust recovers $300,000 with no arrests, FBI helps smash crypto scam targeting Russian speakers in Brooklyn, Brooklyn Prosecutors Take Down 112 Servers Behind Crypto Scam Targeting Russian Speakers - Decrypt