Explainer: Sanctions law behind Putin's request to Trump for former U.S. officials

INSUBCONTINENT EXCLUSIVE:
Russian President Vladimir Putin's request to U.S
President Donald Trump for a joint investigation of former U.S
officials sought by the Kremlin for "illegal activities," including a U.S
ambassador to Russia, is just the latest effort in a years-long campaign to undermine a U.S
law that imposes financial sanctions on Putin's officials.