thirds over the same period. joe biden said sanctions carry a price, and not just for russia. the united states is targeting the main artery of russia's economy. we are banning all imports of russian oil and gas and energy. that means russian oil will no longer be acceptable at us ports, and the american people will deal another powerful blow to putin's war machine. this is a move that has strong bipartisan support in congress and i believe in the country. america have rallied to support the ukrainian people and made it clear we will not be part of subsidising putin's war. mike finley is a fellow in energy and global oil at rice university's baker institute. i asked him about the likely impact of the ban. oil and gas account for half of russia's total exports and 40% of government revenues, trade between russia