Rubl

All the mantles observed in Russia were of German make. They brought a high price at first, about one rubl each, or say about 75 cents, and were eagerly snapped up at that.

Source: wiktionary

Annually 3 karb (probably meaning the Ukrainan^([sic]) rubl, similar to the Russian rubl and ordinarily 50 cents in American money).

Source: wiktionary

In 2005 Russia achieved a seventh successive year of economic growth, which has averaged 6.4% annually since the financial crisis of 1998. Although high oil prices and the relatively low value of the Russian rubl have been important drivers of this economic recovery, investment and consumer-driven demand have played a noticeably increasing role since 2000.

Source: wiktionary

Decisions taken by the Crimean legislature following the disputed referendum included submitting an application for the territory to join Russia, replacing the Ukrainian currency (hryvnya) with the Russian rubl, and permitting Crimean soldiers to join the Russian military.

Source: wiktionary