Could Diplomatic Pact Ease Conflict in Ukraine?

In Geneva today, the US, Russia, Ukraine and the European Union agreed on what they called "concrete steps to de-escalate tensions and restore security for all citizens. Secretary of State John Kerry said he expected Russia to insist that pro-Russian separatists they've been supporting to "lay down their arms, leave the buildings, and pursue their political objectives through the Constitutional processes that the agreement guarantees." Andrew Weiss, who dealt with Ukraine and Russia at the State Department and the National Security Council during the Clinton and Bush Administrations, is Vice President for Studies at the Carnegie Endowment.