John Kerry in UK to Discuss ISIL and Migration Crisis

US Secretary of State John Kerry met with British Foreign Secretary Philip Hammond in London to discuss the Syrian conflict and the migration crisis. They emphasized the need to address the root causes of migration and the prolonged conflict in Syria. Kerry mentioned potential diplomatic efforts, especially with Russia's increased involvement against ISIL. However, Russia's military support for Bashar al Assad complicates the situation. The discussion highlighted the challenges in finding a political settlement and the ongoing humanitarian crisis.

What is the relationship between tackling ISIL and the regime of Bashar al Assad as discussed in the talks?

What challenges are mentioned regarding the resolution of Syria's civil war?