What was the purpose of the US President's special envoy's visit to Ukraine amid the ongoing conflict?

The US President's special envoy on Russia and Ukraine visited Ukraine amid escalating tensions, though the outcome of these meetings remains unknown. This diplomatic visit occurred against a backdrop of increasing Russian military activities, including drone attacks in Odesa that left residents without power and heat during freezing conditions. The timing is significant as it coincides with an onslaught of comments from the US Administration directed toward President Zelensky. The visit appears to represent ongoing diplomatic efforts to address the conflict, even as the situation on the ground continues to deteriorate with critical infrastructure damage and humanitarian challenges mounting.