While Russian federal revenue from oil and natural gas production has declined significantly in response to low oil prices, oil and natural gas companies have actually increased investments or only seen modest declines, according to the EIA. In ruble terms, the Brent price has actually increased by 40 percent from 2010 levels, while decreasing in dollar terms by 40 percent. This was due to the rapid devaluation of the ruble due to international sanctions and lower oil prices.