Ukraine's military have retaken control of several towns and cities in eastern Ukraine.
Earlier today the separatist town of Slaviansk was taken by soldiers, and pro-Russian rebels were forced to flee, though they said it was a "tactical retreat."
Lewis Vaughen-Jones reports.
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He told Peston on Sunday: "The country is crying out for leadership from the Prime Minister. We want to know her vision."
All the profits from the sale of each download of the forthcoming single would go to Shooting Star Chase and Together for Short Lives.