Looking to deepen pain for Putin, West studying oil and gas sector

The United States unleashed some of its toughest actions against Russian President Vladimir Putin right after he rolled his troops into Ukraine.

Polls in the U.S. find that people want Washington to do more. So what’s left, financially, diplomatically and militarily, to step up the pressure?

The U.S. could get strong results from any number of next steps, economists and current and former U.S. officials say.

It could simply persist in pouring cash and potent weaponry into Ukraine a likely course.

It could even commit to shutting down some of the inroads the Kremlin has made into U.S. political and financial systems, also conceivable.