US Secretary of State Marco Rubio on Sunday hailed talks with a Ukrainian delegation in Florida as "very productive," but cautioned that more work was required to halt Russia's war with its neighbor.

 

"We had another very productive session, building off Geneva, building off the events of this week," Rubio told reporters. "But there's more work to be done."

 

Ukraine's security council secretary Rustem Umerov, who led Kyiv's delegation, also hailed the negotiations as "productive and successful."