What are the key developments in U.S.-Russia-Ukraine diplomatic efforts following the Saudi Arabia meeting?

Following diplomatic meetings in Saudi Arabia, two high-level working groups are being established, and President Zelensky plans to visit Saudi Arabia in March. President Trump's envoy for Russia and Ukraine, General Keith Kellogg, announced plans to spend three days in Ukraine this week and to make multiple return visits to brief President Trump directly on Ukraine's perspective. This diplomatic pause may provide Europeans an opportunity to exert influence in the peace process. However, a significant caveat remains - President Trump, who ultimately determines U.S. foreign policy, has yet to personally weigh in on these developments, leaving the final direction of U.S. policy toward Ukraine uncertain.