The Ukrainians have — twice in the last 24 hours — stopped Russians efforts to cross the Siverskyi Donets River in the Luhansk oblast, blowing up two pontoon bridges near Bilohorivka. A satellite image collected by geospatial intelligence firm BlackSky shows a Russian pontoon bridge crossing the river on May 10 shortly after a Ukrainian artillery barrage hit the surrounding area. #WolfBlitzer #TheSituationRoom #CNN