E970 is an ATT version. Its different in size a little bit, has microSD slot and 8 Mp camera. E973 is an international version with 32Gb built in memory, but without an SD card slot and has 13 Mp camera.
I think you will have a hard time finding Russian ROM right now, however LGOG should be released in Europe soon, and it may have Russian in the European version.
AT&T LG Optimus G Stock JB Rooted/Unlocked
Samsung Galaxy SII with NeatRom