The legislation, which would allow the president to levy a 500% tariff on imports from countries that purchase Russian uranium, gas and oil, has gained momentum in the Senate as Trump has signaled he will escalate US action against Russia.

Ukraine and Russia have escalated their shadow war of espionage, sabotage, and assassinations, with both countries claiming a growing list of captured agents, intercepted plots, and cross-border attacks.

A top ally of Trump, Republican Sen. Lindsey Graham of South Carolina, said Sunday that the conflict is nearing an inflection point as Trump shows growing interest in helping Ukraine fight back against Russia.