I didn’t know Putin was protecting the Kurds?
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Putin pulled off a brilliant piece of diplomacy and pretty much said he backed Kurdistan. The Syrian Kurds then switched over to Russia's side and opened an office in Moscow - sort of a future embassy.
The Russians twisted Assad's arm in accepting this because the Kurds would straddle the Turkish-Syrian border and serve as a buffer state and cut off the Turkish pipeline to the Syrian rebels.
Kurds are not ISIS so yes Putnam is protecting the Kurds.