Former National Security Council official Fiona Hill discusses why Russian President Vladimir Putin may be skipping the G20 summit in Rome. | CNN

Russian President Vladimir Putin said during his Thursday news conference that he has "reservations" about a 30-day ceasefire proposal in the Ukraine war, saying it's not clear how the situation would develop in the region of Kursk and elsewhere if a ceasefire was implemented. Putin lauded the US proposal as "great and correct" and said Russia supports it in theory, but there are many things that still need to be discussed. The comments come as American special envoy Steve Witkoff arrived in Mos