For over a week now, Sultan Erdogan has been sending his Army into Syria. He says it is to bolster the Turk observation posts that were allowed as per the Sochi Agreement. There are estimates of 6000 troops and 1400+ military vehicles, including tanks, APCs and artillery. SAA and Turks traded artillery fire today. Reports (not confirmed) of six Turk KIA and several more wounded. The Turks claim 100+ SAA KIA but there is no evidence at this time to support this claim.
On 3 Feb 20, either SAA or RuAF planes struck a Turk convoy WEST of SARAQIB:
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Update:
Reports now of another convoy hit in the vicinity of AL ATARIB (WEST of ALEPPO). The convoy was transporting APCs. Initial reports said it was a Turk convoy but now sources say it was HTS/Al Qaeda. There was RuAF operating in the area at the time, so it's highly conceivable they struck another convoy.