The announcement Thursday that President Vladimir Putin has approved Depardieu's application for citizenship is almost a real-life analogue to the French actor's 1990 comedy "Green Card," in which his character enters into a sham marriage in order to work in the United States.

But in this version, taxes appear to be at the heart of the matter. Depardieu has waged a battle against a proposed super tax on millionaires in his native country.

French President Francois Hollande plans to raise the tax on earned income above (EURO)1 million ($1.3 million) to 75 percent from the current 41 percent, while Russia has a flat 13-percent tax rate.