Whatever happened to the M-55?

At least I think it was called the M-55, been so long since I’ve read anything about it all I can remember is that it looked a lot like Russia’s answer to the U-2!
Can anyone else recall this aircraft, think it was known as “Dream” or something like that, can’t even remember what company built it but it did resemble a Russian U-2.
The last thing I read was that an aircraft…the prototype…was at Kubinka outside Moscow undergoing high altitude trials, this was ’92!
Sorry I can’t remember anything else…can someone provide some details? 😮