“America should not legitimize Russia’s aggression in Ukraine or its biochemical attack on the United Kingdom. Sanctions may not change Moscow’s behavior. After all, research by the Peterson Institute International Economics found that, ‘Since 1970, unilateral US sanctions have achieved foreign policy goals in only 13 percent of the cases.’ In addition, sanctions research shows that ‘incentives to bargain’ are needed for success since diplomacy requires both sticks and carrots. That means America must decide under what realistic conditions sanctions should be increased or decreased.” Read more here.