I am indebted to the truly excellent and regularly updated maps produced by IUC Analysts - rapidly available on the Pietervanostaeyen blog.
There are two gateways into Syria through Turkey; through the eastern one, ISIS receive arms, equipment, volunteers, supplies and goods, all with Turkish compliance. Through the Western, the US, French and Saudi supported rebels, including the al-quaeda murderers of Christians, al-Nusra, who hold a number of border towns including Harem, Salqin and Armanaz (clicky to see big - they're the dark grey) do the same. From the news reports, Russian air activity is aimed at a precursor to ground troops first closing the western of the border gateways.
We must then rely on Russia to close the ISIS access to Turkey with the help of the Kurds (yellow on the map); encouraging the Kurds to take and occupy an in-depth zone right alomg the Turkish border will halt the terrorist supplies from the US, France, KSA and do more to bring peace to Syria than anything the UK has done.
Make no mistake; Turkey and the KSA are our real enemies, and the real threats to peace. We need to pour money and troops into Greece to secure Europe's Eastern flank against Turkey, and give full support to Russia, Syria and the Kurds in blocking Turkey from the South. Only then will peace start to return to Iraq and Syria, and the tsunami of migrants into Europe actively facilitated by Turkey start to stem. Oh yes. We need to kick Turkey out of NATO.
Meanwhile, Russian pilots flying straight line sorties from bases around Latakia to al-Nusra border strongholds are safe to do so until the US gets missile defences in place - when they'll have to start detouring southwards a smidgeon to avoid Turkish territory.