How many russian Sukhoi have been updated during the last decade?

There are conflicting informations about the number of Su-27S involved in the update programme (before the contract of MAKS for 12 Su-27SM3s): are they 48 or 55? And how many of them are in service today?

Regarding the two-seaters, how many Su-27UBs and/or Su-30s have been updated?

How many Su-30SMs has the VVS (not AV-MF) ordered this year? 18 or 28?