Washington is preparing a Syrian invasion by Turkey and Saudi Arabia, the purpose of which is to split Syria in half with Washington controlling the eastern part with the oil fields.
Possibly this is a bluff to get Russia to accept a Syrian settlement less favorable to Russian, Iranian, and Syrian interests. However, the Russian government cannot risk that it is only a bluff. If a US/Turkish/Saudi force were to arrive first in Raqqa and Deir Ezzor, Syria would be dismembered.
The Russians can get there first by dropping in paratroopers. In other words, what the insane neoconservatives are doing is giving the Russian government a big incentive to introduce Russian ground troops into the conflict. Once those troops are there, you can safely bet that the insane neoconservatives will cause conflict between them and US/Turkish forces. A wider war will have begun from which neither side can back down.
Here is a description of the race to Raqqa.
Here is The Saker's take on the seriousness of the situation.