president putin has suffered an embarrassing setback in the war with ukraine, after a huge explosion on the only bridge linking russia with the crimean peninsula. the bridge partially collasped, but has now reopened to light traffic. russia annexed crimea in 2014 and, after occupying these regions of ukraine in red, it s managed to establish a corridor up through southern and eastern ukraine. the kerch bridge connecting russia to the crimean peninsula in the black sea was an important supply route for sending russian troops and artillery into ukraine. the blast there is another humiliation for the kremlin, as our russia editor, steve rosenberg, reports. it is the bridge the kremlin built, and it was under attack. an explosion at dawn. this was the result. russian officials claim a lorry had been blown up here and that the fire then spread to a fuel train. whatever the cause, you can see the damage. this is the bridge that links russia to annexed crimea, and parts of the r