[MAIL] Russia has amassed more than half a million troops on the front line in a dramatic bid to overpower Ukrainian forces, analysts say.
Vladimir Putin's army significantly outnumbers the Western-backed troops, forcing them to use up ammunition supplies.
Dr Jack Watling, from the Royal United Services Institute (RUSI), said: 'The Russian forces have now expanded to 510,000 troops.
'The outlook for Ukraine is bleak. Its allies must replenish stockpiles.'
The warning came as Russia continued its advances in northern Ukraine, which threaten the country's second city, Kharkiv.
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