They'll do fine in administering the portions they captured, which is what they set out to do.
The ruble is virtually worthless
Only when measured against the USD.
and their oil and gas industry will have to be almost completely rebuilt if it ever comes back at all.
Oil & Gas will continue to rise in value. It will be worth extracting.
Time will tell.
Or any other currency, or world traded commodity.
Only in Russia would somebody think that a currency has value all by itself.