I watched the entire interview on RT, and although it was dubbed-over in English, I doubt RT would twist Putin's words.
At 2:30 he clearly states that he will not rule out supporting a US strike against Syria
At 3:40 he states that Russia firmly believes that use of chemical weapons is a war crime and that Russia will take a "compelling stance" (should there be solid proof of Assad's guilt)
6:00 if detailed evidence is provided of Assad's guilt, Russia "will take decisive and serious action" (he does not detail specifically what action)
He also turns the question back on the American journalist, asking what America would do if it turns out that the insurgents were responsible for releasing the chemical weapons.