This sort of warning is sometimes a prelude to war.
This is not good. Turkey is part of NATO. We are obligated by treaty to defend them if they are attacked.
Due to Obama’s feckless nature, Putin may believe this is a good time to show NATO as a paper tiger. He likely believes that the U.S. will back down, and he may be right.
On the other hand, President Obama may feel a need to “side with the Muslims”. He may feel a greater loyalty to Turkey and the Muslim population than to Russia.
After all, Russia is no longer the Soviet Union, who he was taught to believe was the greatest good in the world, by his family and mentors; it is now a Christian nation.