Update.
Negotiations in Moscow seem to have brought no resolution to the Russo-Turkish head-butting in Idlib. Turkey has consequently stated that they expect support from NATO due to the escalation in Syria.
Угрозы "друга Реджепа"
После боестолкновений в Сирии Турция запросила поддержки НАТО (Pogran1970)
Consequently the Turks have backed a decisive rebel counter-offensive against Nayrab. Syrian forces are using Smerch MLRS and Tochka IRBMs, the VVS is launching air strikes. The Turks are using T-122 MLRS and T-155 howitzers to support their offensive, and some Turkish light armor has been handed over to the rebels. It also appears Turkish M-60s, upgraded, are also supporting the attack. Russian sources claim that Turkish artillery ceased fire after being located by unspecified Russian assets. So far 2 Turkish KIA and 5 WIA have been confirmed. Interestingly some of the Turkish tanks are carrying Zaslon APS (under the name Pulat). Some sources claim Turkish tanks have entered Nayrab, but it appears they haven't taken it. Given unsupressed Syrian artillery, and the work of Russian combat jets, success seems unlikely.
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https://vk.com/milinfolive?w=wall-123538639_1339398
https://vk.com/milinfolive?w=wall-123538639_1339406
https://vk.com/milinfolive?w=wall-123538639_1339539
https://vk.com/milinfolive?w=wall-123538639_1339552
https://andrei-bt.livejournal.com/1582825.html
http://classic.newsru.com/world/20feb2020/syria.html
http://gurkhan.blogspot.com/2020/02/blog-post_20.html
https://colonelcassad.livejournal.com/5652474.html
https://colonelcassad.livejournal.com/5652564.html
https://diana-mihailova.livejournal.com/4544899.html
Footage of a destroyed Turkish IFV, and many dead rebel fighters.
Warning extremely graphic footage.
https://colonelcassad.livejournal.com/5653218.html
Some footage of the first abortive assault on Nayrab by the rebels.
https://colonelcassad.livejournal.com/5636056.html
Two Syrian helos were shot down, and one badly damaged over Idlib and western Aleppo provinces. MANPADS are the likely culprits, and it's noteworthy that at least one Russian jet took fire from a MANPADS on video.
https://imp-navigator.livejournal.com/901895.html
https://diana-mihailova.livejournal.com/4523913.html
https://diana-mihailova.livejournal.com/4519310.html
http://classic.newsru.com/world/11feb2020/idlib.html
https://diana-mihailova.livejournal.com/4506450.html
There are unconfirmed reports that the Turks have requested Patriot SAMs from the US. It's interesting how this is related to Syrian claims that Russia is keeping the Turkish airforce out of Syrian airspace.
In the meantime Turkey has deployed advanced EW near their border.
https://ria.ru/20200220/1565026130.html
https://tass.ru/mezhdunarodnaya-panorama/7810123
https://twitter.com/TSKMap/status/1227488012449304577
Some photos of equipment captured from the rebels by the Syrians.
https://vk.com/milinfolive?w=wall-123538639_1340074
https://vk.com/milinfolive?w=wall-123538639_1339848
The Syrian express continues work, as Dvinnitsa-50 is headed for Tartus.
https://vk.com/milinfolive?w=wall-123538639_1339829
Turkish troops continue to enter Idlib, there are now as many as 7000 in the province. This is no small force and given the collapsing rebel forces, this might be the only viable option to prevent Assad from taking all of Idlib.
https://vk.com/milinfolive?w=wall-123538639_1337732
https://vk.com/milinfolive?w=wall-123538639_1330355
https://vk.com/milinfolive?w=wall-123538639_1327930
Meanwhile the M-5 highway is under Syrian government control. A special note, the Sochi accords required Turkey to set up a regime that would allow safe traffic movement on that highway, which they had failed to do. It's quite likely that taking this highway as part of the current offensive is diplomatically being couched in terms of Turkish failure to meet their obligations, though of course the details remain under wraps.
Interestingly enough Turkish checkpoints are still functioning on M-5 and even allow Russian troops to pass through.
https://afirsov.livejournal.com/522128.html
https://vk.com/milinfolive?w=wall-123538639_1334686
https://vk.com/milinfolive?w=wall-123538639_1334533
https://vk.com/milinfolive?w=wall-123538639_1333138
Syrian forces have also taken the Anadan bulge, pushing rebel lines back from Aleppo. Turkish-supplied IFVs are cropping up more and more, and getting destroyed left and right.
https://colonelcassad.livejournal.com/5644315.html
https://vk.com/milinfolive?w=wall-123538639_1333405
https://vk.com/milinfolive?w=wall-123538639_1333569
High pressure encounters between the US and Russia, and the US and Syria, continue in north-eastern Syria, with a US MRAP attempting to run a Russian Tigr armored car off the road. A civilian almost gets run over in the process, and the US attempted to force a Syrian checkpoint.
Russian MoD claims that the US has killed a Syrian civilian, a teenager, in a recent encounter.
It also appears that in at least one incident Rusisan MPs had to convince locals to stay away from a US convoy (4th link).
https://colonelcassad.livejournal.com/5651165.html
https://diana-mihailova.livejournal.com/4522829.html
http://classic.newsru.com/world/12feb2020/boysyria.html
https://vk.com/milinfolive?w=wall-123538639_1331653
A US soldier is attempting to prevent locals from tearing down a US flag near Qamishli.
https://vk.com/milinfolive?w=wall-123538639_1335201
The T-90 captured by the rebels appears to still be in service.
https://andrei-bt.livejournal.com/1578071.html
Russian MPs in Maaret an Nuuman, a town recently taken from the rebels.
https://vk.com/milinfolive?w=wall-123538639_1334604
ISIS has resurfaced near Palmyra, attacking SAA forces.
https://vk.com/milinfolive?w=wall-123538639_1333665
The first Russian Tayfun 4X4 has been sighted in Syria.
https://vk.com/milinfolive?w=wall-123538639_1331832
The TOS-1 (1A?) has been deployed near Aleppo.
https://vk.com/milinfolive?w=wall-123538639_1333560
Khmeimeem airbase came under UAV attack again, successfully downing both drones. Russian sources claim that US aircraft were acting as controllers for the drones, though evidence is lacking.
https://diana-mihailova.livejournal.com/4505806.html