Moscow - Moscow's metro system is famed for its Stalin-era stations with glittering chandeliers and mosaics, but architects are taking a radical new approach as the network undergoes a massive expansion.

Three portraits of former Soviet dictator Joseph Stalin are on display in the centre of Donetsk, the rebel capital of eastern Ukraine, as the separatist authorities fuel a mood of Soviet nostalgia. The portraits, adorning a main square, seem to go down w