Ukraine's interior minister said Friday that it will take years to defuse unexploded ordnances after the Russian military operation.<br />'' <br />'' Speaking to a news agency in the besieged Ukrainian capital, Denys Monastyrsky said that the country will need Western assistance to cope with the massive task once the war is over.<br />'' <br />'' A huge number of shells and mines have been fired at Ukraine and a large part hasn't exploded, they remain under the rubble and pose a real threat, Monastyrsky said.<br />'' <br />'' In addition to the unexploded Russian ordnances, the Ukrainian troops also have planted land mines at bridges, airports, and other key infrastructure to prevent Russians from using them.<br />'' <br />'' He noted that another top challenge is dealing with fires caused by the relentless Russian barrages. He said there's a desperate shortage of personnel and equipment to deal with the fires amid the constant shelling.