- Treisman: Russia plane disaster puts spotlight on Vladimir Putin's decision to enter Middle East conflict
- Putin says Russian flights to Egypt should be suspended until more is known
Daniel Treisman is a professor of political science at the University of California, Los Angeles, author of "The Return: Russia's Journey From Gorbachev to Medvedev," and director of the Russia Political Insight project. The opinions expressed in this commentary are his.
(CNN)If investigators establish that the Airbus 321 that crashed in the Sinai peninsula last Saturday was destroyed by a terrorist bomb, it will bring home to Russians with awful concreteness the potential cost of the war their country is now fighting in Syria.