Wouldn't hitting arms delivery not be preferable action as less weapons would mean less tension. Surely the US would get the message. And if they insist on supplying from alternative routes we'd send a different message, like hitting oilfields.
We can't do nothing because for our enemies time is their ally.
Hitting at the exact moment arms delivery is done is a bit risky as there is most probably US personnel supervising the transfer procedure. Hitting weapons depots may be possible and I think we've done it in the past. By the way, we are not sure what is the action that aggravated our stance, so this is a speculation. There may be other reasons that we don't know of.
A bit of news.
According to Euphrates Post, a closed session meeting was held a between YPG leaders and Syrian regime officers under the supervision of Russian forces at the Russian base in Tel Semen in the northern countryside of Raqqa.
The meeting was held at the request of YPG/PKK leaders and was held in the region under the supervision of Russian forces. It was also claimed that Syrian regime officers requested that the YPG allow the establishment of a regime-affiliated security zone in the city of Tabqa, but the YPG rejected this request and will investigate the issue.
A couple days ago MIT's UCAVs carried out strikes against a headquarters used by YPG/PKK terrorists in Khazwan/Khizwan - Jebel Abdulaziz Mountain, 50 kilometers from the Turkish border and 20 kilometers from the front line.
The situation in Gaza is also carrying its effects in Syria. In order to escalate the situation for the PKK/YPG and the US, the Regime (probably according with IRGC's directives) supported tribal fighters to cross the Euphrates river in the area of Deir Ez-Zor and launch operations against the YPG/PKK. We knew that something is brewing there as YPG/PKK sent hundreds of fighters in the area from the south of Hasakah and Qamishly in order to reinforce the area where the oil fields are.
There is a serious tension between YPG/PKK and the Regime after the Regime arrested a highly positioned YPG/PKK figure in the Sheikh Maqsood neighbourhood in Aleppo (you can check the previous page). Along with tension in Aleppo and Deir Ez-Zor we know that the YPG/PKK took action against the Regime/NDF in Qamishly and Hasakah.
Meanwhile the tension in our areas is also rising. Yesterday a VBIED attack was carried out by the HRE/PKK (IRGC and Russia supported). Not only that, but right after the explosion the rescue teams were targeted in a "double tap" way by HRE/PKK or Regime artillery preventing the timely rescue operation.