Days after representatives cited small trade volumes between the countries, the White House offered a new justification for lack of measures against Moscow.

The U.S. did not impose tariffs on Russia, despite imposing tariffs on over 180 different countries and territories, because "we're not doing business" with Russia, U.S. President Donald Trump said on April 7.

The Trump administration says sanctions imposed on Moscow mean the U.S. does little trade with Russia, but questions persist about the motivations.