Millions of people in Ukraine are living with the fear of a Russian invasion.
One possible target for a Russian attack is the strategic port city of Mariupol in the east of the country, with access to the Black Sea.
It lies close to the Russian border and its capture could allow Moscow to establish a land corridor to Crimea, which Russia annexed in 2014.
Reeta Chakrabarti presents BBC News at Ten reporting by international correspondent Orla Guerin in Mariupol.
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