KEY POINTS
  • The Russians have sustained more casualties than expected, but are still "advancing steadily," said Niall Ferguson of the Hoover Institution.
  • "The assumption that this is going to drag out, that the United States can sit back and watch the economic sanctions do their work may be gravely mistaken," Ferguson said.
  • Sanctions may be able to change Putin's behavior down the road, but cannot be used to stop the violence, said Anna Ohanyan of the Carnegie Endowment for International Peace.

The strategy of sitting back and waiting for Russia's war machine to grind to a halt because of sanctions could go "terribly wrong," according to Niall Ferguson, a senior fellow at the Hoover Institution at Stanford University.

"It's a highly risky strategy," he said.