The war in Ukraine has now gone on for more than two and a half years. At one point The Guardian reported that Ukraine has become the most mined country in the world, with Russia laying down literally millions of mines. In some areas Ukranian forces have uncovered five mines per square meter. The estimate is that using state of the art technology it would take centuries to clear all the mines, and that's not accounting for the fact that Russia is actively in the process of putting down more. Until we reach a more civil level of society, I don't think a true cleanup is possible.