Putin is escalating tensions vis-a-vis Ukraine now.
First, after scaling down his support for Assad, the equipment thus released was mostly relocated to Crimea,
including S-400 Triumf SAM systems. In addition, Russia increased its forces on both sides of Ukraine, by holding "exercises" in Transnistria as well as increasing troop amounts near Donbass.
Then, to cover up for that, FSB kidnapped a bunch of hapless Ukrainians near the Crimean border and dressed them up as Ukrainian "super spies", forcing them to read made up "confessions" in the best Soviet style.
Finally, Putin emerged in public faking outrage and announcing withdrawal from the next round of Minsk negotiations - negotiations that Russia had demanded in the first place.
What's up? Nobody knows. Is this merely posturing for domestic consumption before next elections? Is Putin actually going to escalate the conflict back to "proper" shooting war status from the low-impact one that is currently going on?
In any case, Russia is holding massive military exercises this fall and, historically, has on occasion sent its troops to fight immediately after (like in 2008 in Georgia and in 2015 for Syria).