evidence: KHERSON, Ukraine (AP) — Exclusive drone footage of the collapsed Ukrainian dam and surrounding villages under Russian occupation showed the ruined structure falling into the flooded river, hundreds of submerged homes, greenhouses, even a church — and no evidence of an attack from above, as Russia alleges. [...] Ukraine in turn has alleged that Russian forces, who controlled the dam, blew it up from within. The AP images offered a limited snapshot, making it difficult to categorically rule out any scenario. The dam had been weakened by months of Russian neglect and water had been washing over it for weeks. [...] Ukraine has warned since last October that the hydroelectric dam was mined by Russian forces, and accused them of touching off an explosion that has turned the downstream areas into a waterlogged wasteland. Russia said Ukraine hit the dam with a missile. Experts have said the structure was in disrepair, which could also have led to its collapse.