“The West has frozen 300 Billion of Euro and Dollar reserves belonging to Russia.”
Ah, I guess I misread your original post. I thought you were talking about Russian ENERGY reserves, not BANK reserves.
So, if, say, Germany deposited $300 billion in euro and USDs in an escrow account, pending receipt of a product (gas, oil; whatever), and that product WAS received by Germany, and Germany took possession of it, and the escrow account has been frozen; then, while not theft, it is arguably Force Majeure (as a condition arose that precluded the completion of the purchase). Now, if Germany froze the escrow account after having taken delivery of the goods, then Russia has a valid reason to scream “FOUL!”
I should have put a dollar or Euro sign in, to make it clearer what I meant by ‘300 Billion’.