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"Taking on Russian oil companies will drain Russia's war chest – and every ruble we take from Putin's hands helps save Ukrainian lives," said Foreign Secretary David Lammy.

That new tax brought in an extra 8.3 billion rubles the first year it was imposed, the Russian business news site RBC reported.

In January and February, the monthly nominal salary in the industry — including for workers in oil and gas production, services, refining, pipeline shipments and storage — averaged some 125,200 rubles, or $1,340.

Some Russians worry that the ruble, which has been propped up by the government after plunging last year, might be allowed to depreciate again, raising the cost of imports.

The government has supported the Russian currency by requiring exporters to change foreign earnings from things like oil into rubles, holding down prices for remaining imports.