Russia has given Ukraine until the early hours of March 21 to surrender the besieged city of Mariupol, according to a Russian state news agency. Russian Colonel-General Mikhail Mizintsev, head of the Russian National Defence Control Centre, has given his counterparts until 5am Moscow time (2am GMT) to respond to his ultimatum, RIA reports. According to the state controlled media outlet, "the Ministry of Defence wants to receive a written response from Kyiv to these proposals before 5am.