Russia in particular seems to be enjoying the current trend, so much so that — if I'm understanding this correctly – Moscow is now receiving more in taxes than it's spending. This is producing something called a "budget surplus," which is a kind of currency war weapon that can be deployed to improve a country's geopolitical position. Here's a quick overview:

Russia To See Oil Revenues Jump Fivefold

(Oil Price) – Due to the oil price rally, Russia expects its oil and gas revenues to jump fivefold compared to the expected revenues set in its 2018 budget, according to the Finance Ministry that now expects Russia to post a budget surplus for the first time since 2011.

Oil and gas exports account for around 40 percent of Russia's federal budget revenues.

Russia's revenues from oil and gas sales are now expected at US$44.4 billion (2.74 trillion Russian rubles) for 2018, up from US$8.5 billion (527.6 billion rubles), according to a budget amendment by the Finance Ministry.