I'd say steal the best from A, but move to support C.
First the expenses need to be in balance, which means defunding the conscipt army and the idiotic fleet of vehicles like tanks (sell them asap to Africa, South America and some areas of APAC). Give e.g. T-54/55 away for free should you have to, just make sure they pay for the transport. The conscipt army isn't popular anyway.
Then we need to invest in areas of growth, consumer good, robotics and IT. We need more houses, with more living space. Make sure to control the media, we need the narrative to help us. Privatisation goes by selling to common Russians, not corporations. Work with bond system for 65%, have the rest in the open market with a maximum owned of 15% per party.
But foremost, absolutely kill the black market and corruption.