Disputes - international: Botswana still struggles to seal its border from thousands of Zimbabweans who flee economic collapse and political persecution; Namibia has long supported, and in 2004 Zimbabwe dropped objections to, plans between Botswana and Zambia to build a bridge over the Zambezi River at Kazungula crossing, thereby de facto recognizing the short, but not clearly delimited, Botswana-Zambia boundary
Illicit drugs: