A double agent poisoned. Putin's revenge?

Sergei Skripal and his daughter, Yulia, were found slumped and unconscious on a bench in a commercial center of Salisbury, England, on Sunday afternoon and are in critical condition. Police say they may have been poisoned by a nerve agent. Skripal is a former Russian intelligence officer who became a double agent for Britain. The poisoning could be a revenge assassination attempt, similar to those carried out in the past by Russia. If so, it would be another brazen crime by President Vladimir Putin that cannot be ignored.