Su-24 airstrike in Hama province.
Russia has performed 448 airstrikes in the last 72 hours.
The Pentagon reports the number of Russian troops in Syria has doubled to 4k. Based on the conservativism of those reports, it is likely there are more troops in country than reported.
Uniformed Russian troops have been geolocated in the vicinity of Homs, Hama and Aleppo. I'd speculate there may be advisers with the Syrian troops, but they are likely to be supporting with artillery and spotting rather than direct fighting. There are reports of irregulars from Ukraine's Donbass being embedded in the Syria Army as 'volunteers' and Russia was recruiting in Ukraine, but...
In the "you can't make this shit up," Sputnik News ran a column stating the British blew up the Russian airliner. This is while the British have placed several airliners in readiness should the Russians ask for help repatriating the stranded tourists in Egypt. The Russians claim they have brought home 11,000 tourists. Many question this number based on the number of flights necessary. it would require a flight every 20 minutes headed to Russia. This has not happened.