Soviet-style arms from North Korea. Serious logistical difficulties resulted from the use of such a menagerie of disparate equipment within individual battalions, forcing the ZNA to standardize equipment on the battalion and later the brigade level. Unfortunately this resulted in additional problems, such as the use of separate communications equipment in certain brigades which were otherwise incompatible with those of other units. The People's Republic of China emerged as the ZNA's largest external supplier of arms during the 1980s. Most of the new artillery, tanks, and APCs accepted into service after 1981 were of Chinese origin. Nevertheless, the ZNA continued to look to a number of diverse suppliers to meet its needs, including member states of the European Union and the Commonwealth of Independent States. Domestic production of small arms and ammunition, including multiple rocket launchers, small arms ammunition, artillery shells, and hand grenades, commenced for the ZNA in the mid-1980s through Zimbabwe Defence Industries (ZDI). The operational readiness and serviceability rate of the army's weapons systems began undergoing a decline during the Second Congo War, due to an inability to source new parts and ammunition at a pace sufficient to keep up with wartime wear. Development loans to the Zimbabwean government by the World Bank and the International Monetary Fund were suspended when the ZNA was accused of diverting the money into the war effort. The ZNA was also badly affected by a subsequent arms embargo imposed by the EU due to allegations of human rights abuses. One consequence of the embargo was that the ZNA was forced to retire much of its technical equipment, namely radios, of Western origin. The logistics problem was further exacerbated during the collapse of the Zimbabwean dollar against major world currencies, which led to further budgetary restraints. Over half the army's tanks and armoured vehicles were rendered unserviceable due to a lack of funds to source spare parts, fuel, or training ammunition. To raise funds, the ZNA was forced to auction off much of its trailers, ammunition trucks, and engineering vehicles. Army ammunition continued to be sourced from ZDI, but the latter suspended operations in 2015 when the ZNA defaulted on its payments. In February 2017, Zimbabwean officials revealed that the army and air force were heavily in debt with Chinese creditors due to defaulting on payments for Chinese arms. The government granted a number of domestic platinum claims to a Chinese defence