Russia lets Turkey know, Russia has Turkey in its crosshairs.

https://sputniknews.com/middleeast/202002201078360646-russian-su-24-planes-strike-pro-turkish-terrorists-allowing-syrian-army-to-repel-attacks/
According to the Russian Reconciliation Centre for Syria, pro-Turkish militants, with the support of the Turkish artillery, broke through the defences of the Syrian army in the areas of Qminas and Nayrab.

Russian Su-24 aircraft have conducted airstrikes against pro-Turkish terrorists, which allowed the Syrian troops to repel all attacks successfully, the Russian Reconciliation Centre for Syria said in a statement. “The Syrian troops destroyed one tank, six infantry fighting vehicles and five pickup trucks containing large-calibre weapons”, the message said.
The Centre also added that four Syrian servicemen were injured by Turkish artillery. The organisation went on to say that Turkey halted shelling against Syrian government troops as soon as Russia notified Ankara that it had detected the Turkish artillery fire.

So, know Russia is prepared to go head to head with Turkey, in Syria.

Next move U.S.A.