What message does increased US presence in Syria send to Russia and Turkey?

ANKARA: The decision by the US to boost its military presence in Syria following an encounter with Russian forces has raised concerns about the message the move sends to Turkey, Russia and Iran, as Washington attempts to reinforce its deterrent role in the region.

However, experts said the show of force is unlikely to alter the status quo in the northeastern part of the country, which is already dominated by American and Syrian Kurdish YPG forces.