Labour foreign secretary Yvette Cooper suggested Moscow could face new sanctions, while his widow has called for Vladimir Putin to be held accountable

The UK and its allies said only Russia would have the ‘means, motive and disregard’ to launch such an attack

Labour foreign secretary Yvette Cooper suggested Moscow could face new sanctions, while his widow has called for Vladimir Putin to be held accountable

Yvette Cooper says claim against Kremlin ‘deeply serious’ while Russia dismisses western ‘feeblemindedness’