Landmines in Ukraine
Ukraine globally ranks as one of the states with the highest civilian casualties from landmines and unexploded ordnances, and the highest for anti-vehicle mine incidents. As of April 2023, it is estimated that approximately 174,000 square kilometers of Ukrainian territory are contaminated by landmines. Many types of landmines have been found in use in Ukraine, including novel variants. Though landmines have been in use since 2014 in Ukraine during the War in Donbas (2014–2022), their use was relatively sporadic until the Russian invasion of Ukraine. According to Human Rights Watch, both Russian and Ukrainian government forces have utilized antipersonnel and anti-vehicle mines. Background 
On 24 February 1999, Ukraine became a signatory of the Ottawa Treaty, which prohibits the use of all types of victim-activated explosive devices. Conversely, Russia and the United States are not signatories of this agreement. On 20 February 2014, Russia government forces invaded and annexed the Crimean peninsula, formally annexing the territory in March 2014. In April 2014, fighting broke out between Russian-backed separatist forces and Ukrainian government forces in eastern Ukraine. On 24 February 2022, Russia initiated a currently-ongoing full-scale invasion of Ukraine, in which both antipersonnel and anti-vehicle landmines have been utilized. Use of mines 
As of January 2023, the State Emergency Service of Ukraine estimates that around 30% of Ukrainian territory may be contaminated by landmines. However, other sources estimate this figure as high as 40%. Russian forces have allegedly engaged in booby-trapping strategic positions from which they have retreated using landmines and other unexploded ordnance. There have been a significant amount of civilian casualties as a result. Ukrainian forces allegedly used a rocket-delivered antipersonnel mine mine in summer 2022, in violation of the Ottawa Treaty. Human Rights Watch traced back handwritten messages on unexploded ordnance to Ukrainian organizations which offered to inscribe “death wishes” on explosives to raise funds for the war effort. Casualties 
From 2014 to 2020, there were 1,190 mine-related casualties in Ukraine. According to the United Nations, from the start of the Russian invasion of Ukraine in February 2022 to July 2023, 298 civilians, 22 of them children, have been killed due to unexploded ordnance, and there have been 632 civilian injuries. HALO Trust estimates that civilian casualties are vastly underreported. Socioeconomic effects 
Ukraine is one of the world's top agricultural producers. More than 55% of Ukraine's land is arable, and as of April 2022, provided employment for 14% of Ukraine's population. Due to the proliferation of mines and other unexploded ordnance in agricultural areas, Ukraine's agricultural sector has suffered more than $6.6 billion in damages. In some contaminated regions like Kherson, farmers have resorted to picking out unexploded shells by sight, and using armored and remote-operated tractors as well as domestic animals to demine their fields. Ukrainian officials estimate that as of March 2023, up to one-third of all arable land (approximately 10 million hectares) in areas of hostility are mined. Demining efforts 
As of July 2023, The World Bank estimates that fully demining affected Ukrainian territory will cost upwards of $37 billion. One of the key issues hindering demining efforts is the lack of qualified bomb disposal specialists and operators. Training generally lasts 4 months, and company certification 3 months. Additionally, there are only two certification bodies in Ukraine, the Ministry of Defence and the State Emergency Service of Ukraine. Additionally, the training of such specialists can be cost prohibitive, with the approximate cost of training a group of explosive specialists being approximately $100,000-$150,000 as of May 2023. References 

Ukraine
Military equipment of the Russian invasion of Ukraine
War crimes during the Russian invasion of Ukraine
War in Donbas