called the new drug threat — in full on bbc iplayer. the main tv tower in ukraine's second biggest city kharkiv has been hit by a russian missile. the local military says the signal has been cut to surrounding areas. footage shows the top collapsing. it's the first time such a mast has been hit since kyiv�*s major antennae was struck in the early weeks of the full—scale invasion. there are no reported casualties. the train drivers�* union aslef has announced another wave of rolling strikes and an overtime ban. disruption is expected from monday sixth may to saturday 11 may. the dispute has been deadlocked since aslef this month rejected the latest pay offer. technology that's supposed to keep drivers safe on england's so—called smart motorways frequently stops working — that's what a bbc investigation has found. panorama has revealed that in the last two years, equipment was hit by hundreds of power cuts, some putting safety