A sanctioned cryptocurrency exchange with ties to Russia said April 16 it has shut down operations after a cyberattack resulted in the theft of more than 1 billion rubles (13.1 million dollars) in assets.

Grinex, based in Kyrgyzstan but linked to Russia, announced the closure in a statement posted on its Telegram channel. The exchange was sanctioned last year by the United States, the United Kingdom, and the European Union.

In the statement, Grinex accused “foreign intelligence services” from unfriendly states of being involved in the cyberattack, though it did not provide evidence. The Kyiv Independent was unable to verify the claim.

“The digital footprints and nature of the attack indicate an unprecedented level of resources and…