The situation in Ukraine's neighbour Moldova, where the Russian-backed separatist territory of Transnistria is located, is under increased scrutiny after a series of explosions.

According to Emma Ashford of the Atlantic Council, the region of Transnistria, where the explosions occurred, is one of the frozen wars of the post-Soviet zone.

''There's always the possibility of things heating up again in a frozen conflict," she added.

The BBC's Ros Atkins looks at why there’s concern that Moldova could be drawn into the war.

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