Despite the conflicts in Syria, Iraq and Afghanistan, the armed uprising in Ukraine and turmoil in other hot spots in the Middle East and Africa, one of war’s most insidious weapons — antipersonnel land mines — have been largely outlawed and drastically reduced, a monitoring group said in a report released Monday.

In the 15 years since a global treaty prohibiting these weapons took effect, the use and production of the mines has nearly stopped, new casualties have plummeted, and more than two dozen countries once contaminated by land mines buried since old wars have removed them, said the report by the group, the International Campaign to Ban Landmines.

“The Mine Ban Treaty remains an ongoing success in stigmatizing the use of land mines and mitigating the suffering they cause,” said Jeff Abramson, the project manager of Landmine Monitor, the group’s research unit.

The group, which won a Nobel Peace Prize in 1997 for its work, released the report to coincide with the Third Review Conference of the Mine Ban Treaty, which convened Monday in Maputo, Mozambique, where representatives from its 161 signers and other participants will spend five days discussing how to further strengthen enforcement of the agreement.