What exactly are the rules?

Turkey has been planning to attack the Kurds for a long time. They have been fighting forever. We have no soldiers or Military anywhere near the attack area. I am trying to end the ENDLESS WARS. Talking to both sides. Some want us to send tens of thousands of soldiers to the area and start a new war all over again. Turkey is a member of NATO. Others say STAY OUT, let the Kurds fight their own battles (even with our financial help). I say hit Turkey very hard financially & with sanctions if they don't play by the rules! I am watching closely.

This entire situation is baffling. I'm tempted to read this tweet as a subtle green light to Turkey, saying there are no US troops nearby is a curious thing to include otherwise. I can't make any sense of Trump-Erdogan relationship.