"...even as officials within the State Department and National Security Council urge more restraint, according to a current and a former administration official..."   Another sourceless article spawned by Obama Administration holdovers in the State Department or NSA.    

At least Trump will not be caught off-mike promising Vladimir his services: 

 “On all these issues, but particularly missile defense, this, this can be solved but it's important for him to give me space,” Obama told Medvedev.
“Yeah, I understand. I understand your message about space,” Medvedev replied.
"This is my last election," Obama said. "After my election I have more flexibility."
"I understand. I will transmit this information to Vladimir," Medvedev said, referring to incoming President Vladimir Putin.
http://whitehouse.blogs.cnn.com/2012/03/26/open-mic-catches-obama-asking-russian-president-for-space-on-missile-defense/

After Obama, these "experts" are worried about Trump. What a bad joke.