https://www.washingtonpost.com/world...=.ba63734bb254
Long story short, in addition to the cease fire agreement, Trump has now ordered the CIA to stop arming anti Assad rebels with weaponry to fight the regime. Given our no boots on the ground policy and Putin's backing of Assad, this is effectively the US pulling itself out of Syria at the request of Moscow with Trump agreeing to set the plan in motion.
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One other concern here is that the CIA's operation was basically controlling who got what weaponry. With that no longer being the case, Turkey can move forward with supplying weapons to who THEY see fit which means more dangerous weapons falling into the hands of the more extremist groups involved in the anti Assad effort. The US has been blocking them for awhile.
So what exactly are we gaining from this? It's a pretty solid blow to the US's standing in the region, loses our support from moderate groups fighting, hands Assad and Putin control of the region, and puts worse weapons in the hands of worse people.