Russia declared a partial ceasefire on Saturday in the two besieged towns of Mariupol and Volnovakha. The Russian defence ministry said humanitarian corridors and exit routes had been agreed upon with the Ukrainian side. This is to allow civilians to leave the two towns, both key targets in the Russian invasion of Ukraine unleashed on 24 February. Russia’s Interfax news agency said Russian forces would be introducing a “quiet regime” from 10:00 Moscow time on Saturday to allow people to leave both Mariupol, a port on the Sea of Azov, and the eastern Ukrainian town of Volnovakha. THE CITY HAS C…