ANONYMOUS has claimed to have hacked Russia's central bank while threatening to release thousands of secret agreement documents in the next 48 hours.

The hacking team claimed responsibility for the alleged attack on Twitter Wednesday evening.

"JUST IN: The #Anonymous collective has hacked the Central Bank of Russia. More than 35.000 files will be released within 48 hours with secret agreements. #OpRussia," the hackers tweeted but failed to provide more detail about the attack.

The alleged hacking comes as highly regarded central bank Governor Elvira Nabiullina reportedly sought to resign after Vladimir Putin ordered an invasion of Ukraine.

Nabiullina's request was denied by Putin, who instead asked her to stay put, NDTV reported citing four people with knowledge of the discussions.

Now, Nabiullina is left to manage the fallout from a war that's quickly undone much of what's she's accomplished in the nine years since she took office.