A Ukrainian deminer carries unexploded material during demining work at an airport in Hostomel, Ukraine.SERGEI SUPINSKY/AFP via Getty Images Ukrainian troops face a perilous challenge in their continued fight against Russia — land mines. The mines have blighted an area of Ukraine roughly the size of Florida, per The Washington Post. Humanitarian clearance work, which is intricate and expensive, can take a long time to complete. More than a year and half after Russian forces invaded Ukraine, land mines have become one of the most daunting issues for the Ukrainian counteroffensive.With Russian forces having laid down mines across broad areas of Ukraine, it is now the most mined country in the world, and the mines — in addition to unexploded bombs and artillery shells — are now prevalent in an area of Ukraine roughly the size of Florida, according to The Washington Post.The drastic changes to the Ukrainian heartland not only threaten the country long-term, but they continue to present enormous challenges for troops seeking strategic advantages against Moscow, having had earlier successes against Russian forces before the mines began to slow down Ukraine's counteroffensive.While there are ongoing efforts to remove the mines, also referred to as unexploded ordnance, the full scope of the situation will likely be unknown for some time as the conflict continues.