...and gas prices would still rise. Energy (oil) is a global market and a decrease in Russian oil would push more countries to buy from us, causing American oil prices to rise.

Unless, I guess, you'd prose nationalizing the oil industry. Then the beneficent folks at FedGov could just shut off the outside taps whenever it was expedient, and set prices at whatever artificially low value the good Capitalists amongst us wanted them to be?