Fortress Zaporizhzhia prepares to fight as war closes in

Trenches are dug and teachers receive gun training in last large city in south-east under Ukrainian control

Outside Zaporizhzhia there are several lines of deep trenches, ringed by sandbags, armed men, and more sandbags and armed men.

But life in the city is surprisingly normal - even busy - for wartime Ukraine. As the only large city in south-east Ukraine under Ukrainian control, Zaporizhzhia has become a destination for the hundreds of thousands of people who fled Russian occupation.