Since the HTS-led offensive on Aleppo began in late-Nov, Turkey's [separate] SNA coalition launched an offensive on SDF-linked territory, capturing Tel Rifat.
As they approached Manbij, the US all but ordered them to give it up in return for a ceasefire.
That ceasefire has been very rocky, and it's 2nd iteration showed signs of collapse today, with threats of SNA assault on Kobani.
The loss of the symbolic town of Kobani would be an immense blow to the PYD-led Kurdish movement in northern Syria.
For now -- and since Russia & Assad forces left the area -- US troops have been patrolling in/around the Kobani countryside, while US diplomacy has sought to deter Turkey from green-lighting a military offensive. It's proving very challenging.
In recent days, the SDF has also lost Sunni Arab forces in Deir ez Zour & faced major protests against its rule in Raqqa & Hasakeh.
In response, the SDF has allowed the green revolutionary flag to be flown from public buildings throughout its territory.
If US-Turkey diplomacy fails & the SDF faces a concerted offensive, the SDF's days will be numbered -- & the US will need to consider withdrawing from Syria.
Today, Turkey's line is: "you leave, we can take over" the northeast & the counter-ISIS fight.
Beyond ISIS's clear resurgence this year, NE Syria is home to ~9,500 ISIS militants in prisons & ~42,000 associated women/children in the al-Hol & Roj camps.
= ISIS's "army in waiting" & potential "next generation," per CENTCOM's General Kurilla.
Hope is not all lost -- the US still has room for a major deal with Turkey, but make no mistake, further big SDF concessions will be necessary & Ankara will need big carrots too (F35/16s, YPG removal from border, HTS recognition & end of Syria sanctions)