Sloppy work Russia? "Russian forces have been demining the areas liberated from the Ukrainian troops for weeks. On May 26, the head of Russia’s National Defense Operations Center, Colonel General Mikhail Mizintsev, said that the Russian troops had finished demining the Mariupol city port and had inspected more than 50 kilometers of the Azov Sea shoreline."
But thank you for doing your best which appears to be inestimably better than the Americans who have left millions of mines & bombs around the world following their acts of piracy & war crimes in many countries.

Explosion kills two, including child, at Mariupol beach
[rt.com]