The US State Department spokesperson John Kirby said that the US is not concerned about the Russian-Turkish improving relations.
"As for a change or modifications to the bilateral relationship between Turkey and Russia, that’s between them," he said.
"And there’s certainly no prohibition against that. There’s no reason for anybody to be concerned. We’re certainly not concerned that – if Turkey and Russia are going to work out a new or different bilateral relationship, based on security and defense issues. That’s for them to decide," Kirby noted.
He added that they value Turkey’s membership in the alliance. "We still value Turkey’s membership and contributions as part of the coalition against Daesh. And as I said, we’re going to continue to look for ways to see that deepen and strengthen," the US State Department spokesperson concluded.
