Top US and Ukrainian officials wrapped up their talks in Florida, with Secretary of State Marco Rubio calling the session "very productive" but saying additional work was needed in the effort to thrash out a plan to end Russia's war on Ukraine. "We had another very productive session, building off [talks in] Geneva, building off the events of this week, but there's more work to be done," Rubio told reporters on November 30 following the meeting, without being specific. "There are a lot of moving parts, and obviously there's another party involved…