Antony Blinken, Biden's secretary of state, is a known Syria hawk and a harsher American stance against Assad is a certainty. But the bigger question is how he'll approach Turkey. There's suggestions he'll be harsher on Erdogan, but then there's little he can do other than hold America's ground. If America does approach Turkey, then another question opens up: is Erdogan willing to worsen his relation with Assad if America insists on it?