China could still take the escalatory step of providing lethal military aid to Russia, US National Security Council spokesperson John Kirby said Friday. 

"We don't believe they've taken it off the table," Kirby told CNN's Abby Phillip, while noting that the administration still doesn't "believe that they've made the decision to move forward."

On fighter jets for Ukraine: Kirby also said that F-16 fighter jets are not a "key part" of the agenda for US President Joe Biden's meetingwith German Chancellor Olaf Scholz this afternoon, but the two leaders will speak extensively on what Ukraine will need this spring and summer for the tough fighting ahead. 

About US detainee in Russia: Asked about detained American Paul Whelan, Kirby said that US Secretary of State Antony Blinken "absolutely" brought it up with his Russian counterpart Sergey Lavrov, despite Russian claims otherwise. 

"Paul Whelan needs to be home with his family and with his friends," Kirby said. "We're going to keep working to get him released and get him back home."