Nato tells Russia to stop military buildup around Ukraine

Alliance warns about largest massing of Russian troops since annexation of Crimea'

Nato's secretary general has called on Russia to halt its military buildup around Ukraine, describing it as unjustified, unexplained and deeply concerning".

Later on Tuesday, Moscow hit back, saying the deployments were a reaction to what it claimed were Nato plans to move troops closer to Russia's borders in the Baltic and Black Sea regions.