term storage in purpose, built seismically safe tanks for several decades, during which much of the radioactivity would decay away and the water would then be much easier to deal with. one other option that s been seriously proposed is that the treated water be used solidified in water or used in concrete for structural applications where most of the radioactivity will be contained and it will have little contact with the environment and certainly won t cause a transboundary and tra nsgenerational pollution issue. those alternatives haven t been seriously investigated. let s return to our top story the wagner boss yevgeny prygozhin who led a failed mutiny against vladimir putin is presumed dead, after being aboard a plane which crashed near moscow. keir giles, is from the russia and eurasia programme at the foreign affairs think tank chatham house.