NATO ally Turkey and U.S.-backed Arab rebels this weekend attacked our most effective allies against ISIS, the Syrian Kurds.
Earlier in August, U.S. planes threatened to shoot down Syrian planes over Hasakeh, and our Iraq-Syria war commander, Lt. Gen. Stephen Townsend, issued a warning to Syria and Russia against any further air strikes around the city.
Who authorized Gen. Townsend to threaten to shoot down Syrian or Russian planes -- in Syria?
When did Congress authorize an American war in Syria? Is the Constitution now inoperative?
That we are sinking into a civil war where we sometimes seem to be fighting both sides is a tribute to the fecklessness of the Barack Obama-John Kerry foreign policy and the abdication of a Congress that refuses to either name our real enemy or authorize our deepening involvement.
Our Congress appears again to have abdicated its war powers.
Consider the forces that have turned Syria into a charnel house with 400,000 dead and millions injured, maimed and uprooted.
On the one side there is the regime of Bashar Assad and its allies -- Hezbollah, Iran and Russia. Damascus buys its weapons from Moscow and has granted Russia its sole naval base in the Mediterranean. And Vladimir Putin protects his interests and stands by his friends.
To Iran, the Alawite regime of Assad is a strategic link in the Shia crescent that runs from Tehran to Baghdad to Damascus to South Beirut and Lebanon's border with Israel.
If Syria falls to Sunni rebels, Islamist or democratic, that would mean a strategic loss for Russia, Iran and Hezbollah, which is why all have invested so much time, blood and treasure in this war.
If they are going to lose Syria, Assad, Iran, Hezbollah and the Russians are probably going to go down fighting. And should we decide to fight a war to take them down, we would find ourselves with such de facto allies as ISIS and the al-Nusra Front, an affiliate of al-Qaida.
Have the hawks who want us to target Assad considered this?
The American people would never sustain such a war in the company of such allies, with its risks of escalation, to remove Assad, who, whatever we think of him, never terrorized Americans or threatened U.S. vital interests.
Years ago, Assad dismissed Obama's demand that he surrender power, then defied Obama's "red line" against the use of chemical weapons. He is not going to depart because some U.S. president tells him he must go.
As for the Syrian Kurds, the YPG, they have sealed much of the border with Turkey and fought their way ever closer to Raqqa, the capital of the ISIS caliphate. But what has elated the Americans has alarmed the Turks.
For the YPG not only drove ISIS out of the border towns all the way to the Euphrates; this summer, with U.S. backing, they crossed the river and seized Manbij.
Turkey's fear is that the Syrian Kurds will link their cantons east of the Euphrates with their canton west of the river and create a statelet that could give Turkey's Kurds a privileged sanctuary from which to pursue their 30-year struggle for independence.
If, when the war ends in Syria, the YPG is occupying all the borderlands, Ankara faces a long-term existential threat of dismemberment.
After recent terrorist attacks on his country, Turkish President Recep Tayyip Erdogan recognizes that ISIS is a monster with which he cannot live. Thus, this weekend, he sent tanks and Arab troops to drive ISIS out of the Syrian border town of Jarablus.
Now Turkish troops and their Arab allies are moving further south into Syria to expel the Kurds from Manbij. Joe Biden, visiting Turkey, told the Kurds to get out of Manbij and back across the river.
How does the U.S. protect its interests while avoiding a deeper involvement in this war?
First, recognize that ISIS and the al-Nusra Front are our primary enemies in Syria, not Assad or Russia. Geostrategists may be appalled, but the Donald may have gotten it right. If the Russians are willing to fight to crush ISIS, to save Assad, be our guest.
Second, oppose any removal of Assad unless and until we are certain he will not be replaced by an Islamist regime.
Third, we should assure the Turks we will keep the Kurds east of the Euphrates and not support any Kurdish nation-state that involves any secession from Turkey.
America's best and wisest course is to stop this slaughter that is killing a thousand Syrians a week, use our forces in concert with any and all allies to annihilate the Nusra Front and ISIS, keep the Kurds and Turks apart, effect a truce if we can, and then get out. It's not our war.