My personal assessment - based upon 23 years of repeated lengthy visits to Ukraine and Russia, numerous intimate contacts with Russians, and continuing communications with Russians in Russia - is that the sanctions are working.
Big-city Russians are not to be compared with starving-but-compliant North Koreans. The unrest among the civilian population is growing.
Regards,
The bottom third of Russian society is surviving and there’s not much to hurt the guy because all of his food is Russian grown.
It’s mostly the middle-class and wealthy that are suffering....in terms of what they used to do with their cash (travel, cars, lux-items, etc).
The Russians with marketable skills will eventually look for ways to leave the country. Long-run...the sanctions open a path for the best and brightest to go elsewhere, and harm the recovery process.