Zambian Foreign Minister Stanley Kakubo participates in a memorandum of understanding signing ceremony with U.S. Secretary Antony Blinken and Democratic Republic of the Congo Foreign Minister Christophe Lutundula, in Washington, U.S., December 13, 2022. REUTERS/Evelyn Hockstein/Pool 

Democratic Republic of the Congo Foreign Minister Christophe Lutundula participates in a memorandum of understanding signing ceremony with U.S. Secretary Antony Blinken and Zambian Foreign Minister Stanley Kakubo, in Washington, U.S., December 13, 2022. REUTERS/Evelyn Hockstein/Pool 

U.S. Secretary Antony Blinken participates in a memorandum of understanding signing ceremony with Democratic Republic of the Congo Foreign Minister Christophe Lutundula and Zambian Foreign Minister Stanley Kakubo in Washington, U.S., December 13, 2022. REUTERS/Evelyn Hockstein/Pool 

Zambian Foreign Minister Stanley Kakubo participates in a memorandum of understanding signing ceremony with U.S. Secretary Antony Blinken and Democratic Republic of the Congo Foreign Minister Christophe Lutundula, in Washington, U.S., December 13, 2022. REUTERS/Evelyn Hockstein/Pool 

U.S. Secretary Antony Blinken participates in a memorandum of understanding signing ceremony with Democratic Republic of the Congo Foreign Minister Christophe Lutundula and Zambian Foreign Minister Stanley Kakubo in Washington, U.S., December 13, 2022. REUTERS/Evelyn Hockstein/Pool 

U.S. Secretary Antony Blinken participates in a memorandum of understanding signing ceremony with Democratic Republic of the Congo Foreign Minister Christophe Lutundula and Zambian Foreign Minister Stanley Kakubo in Washington, U.S., December 13, 2022. REUTERS/Evelyn Hockstein/Pool 

U.S. Secretary Antony Blinken participates in a memorandum of understanding signing ceremony with Democratic Republic of the Congo Foreign Minister Christophe Lutundula and Zambian Foreign Minister Stanley Kakubo while Democratic Republic of the Congo President Felix Tshisekedi looks on, in Washington, U.S., December 13, 2022. REUTERS/Evelyn Hockstein/Pool 

U.S. Secretary Antony Blinken participates in a memorandum of understanding signing ceremony with Democratic Republic of the Congo Foreign Minister Christophe Lutundula and Zambian Foreign Minister Stanley Kakubo while Democratic Republic of the Congo President Felix Tshisekedi and Zambia's President Hakainde Hichilema look on, in Washington, U.S., December 13, 2022. REUTERS/Evelyn Hockstein/Pool 

U.S. Secretary Antony Blinken participates in a memorandum of understanding signing ceremony with Democratic Republic of the Congo Foreign Minister Christophe Lutundula and Zambian Foreign Minister Stanley Kakubo in Washington, U.S., December 13, 2022. REUTERS/Evelyn Hockstein/Pool 

U.S. Secretary Antony Blinken participates in a memorandum of understanding signing ceremony with Democratic Republic of the Congo Foreign Minister Christophe Lutundula and Zambian Foreign Minister Stanley Kakubo in Washington, U.S., December 13, 2022. REUTERS/Evelyn Hockstein/Pool 

U.S. Secretary Antony Blinken poses with Democratic Republic of the Congo Foreign Minister Christophe Lutundula, Democratic Republic of the Congo President Felix Tshisekedi, Zambia's President Hakainde Hichilema and Zambian Foreign Minister Stanley Kakubo during a memorandum of understanding signing ceremony in Washington, U.S., December 13, 2022. REUTERS/Evelyn Hockstein/Pool 

U.S. Secretary Antony Blinken poses with Democratic Republic of the Congo Foreign Minister Christophe Lutundula, Democratic Republic of the Congo President Felix Tshisekedi, Zambia's President Hakainde Hichilema and Zambian Foreign Minister Stanley Kakubo during a memorandum of understanding signing ceremony in Washington, U.S., December 13, 2022. REUTERS/Evelyn Hockstein/Pool 

U.S. Secretary Antony Blinken meets with Democratic Republic of the Congo Foreign Minister Christophe Lutundula and Zambian Foreign Minister Stanley Kakubo during a memorandum of understanding signing ceremony in Washington, U.S., December 13, 2022. REUTERS/Evelyn Hockstein/Pool 

Zambian Minister of Justice, Mulambo Hamakuni Haimbe signs a book of condolence at Lancaster House in London, following the death of Queen Elizabeth II. Picture date: Sunday September 18, 2022. Jonathan Hordle/Pool via REUTERS 

Zambian Minister of Justice, Mulambo Hamakuni Haimbe signs a book of condolence at Lancaster House in London, following the death of Queen Elizabeth II. Picture date: Sunday September 18, 2022. Jonathan Hordle/Pool via REUTERS 

Zambian President Hakainde Hichilema arrives for the Leaders' Retreat, on the sidelines of the Commonwealth Heads of Government Meeting at the Intare Conference centre in Kigali, Rwanda June 25, 2022. Dan Kitwood/Pool via REUTERS 

Zambian President Hakainde Hichilema arrives for the Leaders' Retreat, on the sidelines of the Commonwealth Heads of Government Meeting at the Intare Conference centre in Kigali, Rwanda June 25, 2022. Dan Kitwood/Pool via REUTERS 

Zambian President Hakainde Hichilema arrives for the Leaders' Retreat, on the sidelines of the Commonwealth Heads of Government Meeting at the Intare Conference centre in Kigali, Rwanda June 25, 2022. Dan Kitwood/Pool via REUTERS 

Zambian President Hakainde Hichilema arrives for the Leaders' Retreat, on the sidelines of the Commonwealth Heads of Government Meeting at the Intare Conference centre in Kigali, Rwanda June 25, 2022. Dan Kitwood/Pool via REUTERS 

Zambian President Hakainde Hichilema looks on during an interview with Reuters at the Africa Mining Indaba 2022 which opened in Cape Town, South Africa, May 9, 2022. REUTERS/Shelley Christians 

Zambian mines minister Paul Kabuswe speaks to media at the Africa Mining Indaba 2022 which opened in Cape Town, South Africa, May 09, 2022. REUTERS/Shelley Christians 

Zambian President Hakainde Hichilema speaks during an interview with Reuters at the Africa Mining Indaba 2022 which opened in Cape Town, South Africa, May 9, 2022. REUTERS/Shelley Christians 

A dry section of the Zambezi river is seen above the gorge on the Zambian side of Victoria Falls, Zambia, following a prolonged drought, December 5, 2019. Picture taken December 5, 2019. REUTERS/Mike Hutchings 

Visitors walk over a bridge as dry cliffs are seen along the parched gorge on the Zambian side of Victoria Falls, Zambia, following a prolonged drought, December 5, 2019. Picture taken December 5, 2019. REUTERS/Mike Hutchings 

Spray rises up in the distance along the parched gorge on the Zambian side of Victoria Falls, Zambia, December 5, 2019. Picture taken December 5, 2019. REUTERS/Mike Hutchings 

A dry section of the Zambezi river is seen above the gorge on the Zambian side of Victoria Falls, Zambia, following a prolonged drought, December 5, 2019. Picture taken December 5, 2019. REUTERS/Mike Hutchings 

A dry section of the Zambezi river is seen above the gorge on the Zambian side of Victoria Falls, Zambia, following a prolonged drought, December 5, 2019. Picture taken December 5, 2019. REUTERS/Mike Hutchings 

A dry section of the Zambezi river is seen above the gorge on the Zambian side of Victoria Falls, Zambia, following a prolonged drought, December 5, 2019. Picture taken December 5, 2019. REUTERS/Mike Hutchings 

Spray rises up in the distance along the parched gorge on the Zambian side of Victoria Falls, Zambia, December 5, 2019. Picture taken December 5, 2019. REUTERS/Mike Hutchings 

Storm clouds gather as a cyclist returns with goods from the Zambian border at Victoria Falls, Zimbabwe January 17, 2019. Picture taken January 17, 2019. REUTERS/Stringer 

Storm clouds gather as cyclists return with goods from the Zambian border at Victoria Falls, Zimbabwe January 17, 2019. Picture taken January 17, 2019. REUTERS/Stringer 

Storm clouds gather as a fuel tanker drives towards the Zambian border at Victoria Falls, Zimbabwe January 17, 2019. Picture taken January 17, 2019. REUTERS/Stringer 

Britain's Prince Harry meets with soldiers during an event commemorating Zambian Second World War veterans at Burma Barracks in Lusaka, Zambia, November 27, 2018. REUTERS/Sumaya Hisham 

Britain's Prince Harry is welcomed as he arrives at an event commemorating Zambian Second World War veterans at Burma Barracks in Lusaka, Zambia, November 27, 2018. REUTERS/Sumaya Hisham 

Britain's Prince Harry meets with veterans during an event commemorating Zambian Second World War soldiers at Burma Barracks in Lusaka, Zambia, November 27, 2018. REUTERS/Sumaya Hisham 

Britain's Prince Harry meets with veterans during an event commemorating Zambian Second World War soldiers at Burma Barracks in Lusaka, Zambia, November 27, 2018. REUTERS/Sumaya Hisham 

Britain's Prince Harry meets with widows of veterans during an event commemorating Zambian Second World War soldiers at Burma Barracks in Lusaka, Zambia, November 27, 2018. REUTERS/Sumaya Hisham 

Britain's Prince Harry meets with widows of veterans during an event commemorating Zambian Second World War soldiers at Burma Barracks in Lusaka, Zambia, November 27, 2018. REUTERS/Sumaya Hisham 

Britain's Prince Harry meets with Zambian President Edgar Lungu in Lusaka, Zambia, November 26, 2018. REUTERS/Sumaya Hisham 

Britain's Prince Harry meets with Zambian President Edgar Lungu in Lusaka, Zambia, November 26, 2018. REUTERS/Sumaya Hisham 

Britain's Prince Harry meets with Zambian President Edgar Lungu in Lusaka, Zambia, November 26, 2018. REUTERS/Sumaya Hisham 

Britain's Prince Harry meets with Zambian President Edgar Lungu in Lusaka, Zambia, November 26, 2018. REUTERS/Sumaya Hisham 

Botswana President Ian Khama (L) chats to Zambian President Edgar Lungu during the swearing in of Zimbabwe's new president Emmerson Mnangagwa in Harare, Zimbabwe, November 24, 2017. REUTERS/Siphiwe Sibeko 

Botswana President Ian Khama (L) chats to Zambian President Edgar Lungu during the swearing in of Zimbabwe's new president Emmerson Mnangagwa in Harare, Zimbabwe, November 24, 2017. REUTERS/Siphiwe Sibeko 

Former Zambian Wildlife Authority's wildlife crime investigator Josias Mungabwa (L) and Garamba National Park manager Erik Mararv pose beside a cutout during a news conference in Hong Kong, China June 6, 2017. REUTERS/Bobby Yip 

Zambian President Edgar Lungu participates in a discussion at the World Economic Forum on Africa 2017 meeting in Durban, South Africa May 4, 2017. REUTERS/Rogan Ward 

Zambian President Edgar Lungu reacts after participating in a discussion at the World Economic Forum on Africa 2017 meeting in Durban, South Africa May 4, 2017. REUTERS/Rogan Ward 

Zambian President Edgar Lungu reacts after participating in a discussion at the World Economic Forum on Africa 2017 meeting in Durban, South Africa May 4, 2017. REUTERS/Rogan Ward 

Israel's President Reuven Rivlin (R) sits next to his Zambian counterpart Edgar Chagwa Lungu during their meeting in Jerusalem February 28, 2017. REUTERS/Nir Elias 

Israel's President Reuven Rivlin (L) stands next to his Zambian counterpart Edgar Chagwa Lungu as he signs a guest book during their meeting in Jerusalem February 28, 2017. REUTERS/Nir Elias 

Israel's President Reuven Rivlin shakes hands with his Zambian counterpart Edgar Chagwa Lungu during their meeting in Jerusalem February 28, 2017. REUTERS/Nir Elias 

FILE PHOTO: A truck travels to a depth of 516 metres below the surface to collect ore at the Chibuluma copper mine in the Zambian copperbelt region, January 17, 2015. REUTERS/Rogan Ward/File Photo 

Zambian President Edgar Lungu arrives for the 28th Ordinary Session of the Assembly of the Heads of State and the Government of the African Union in Ethiopia's capital Addis Ababa, January 31, 2017. REUTERS/Tiksa Negeri 

Zambians await their turn to cast their votes during the presidential and parliamentary elections in the capital, Lusaka, Zambia, August 11, 2016. REUTERS/Siyabonga Sishi 

Zambians await their turn to cast their votes during the presidential and parliamentary elections in the capital, Lusaka, Zambia, August 11, 2016. REUTERS/Siyabonga Sishi 

Zambian President Edgar Lungu attends the opening ceremony of the 26th Ordinary Session of the Assembly of the African Union (AU) at the AU headquarters in Ethiopia's capital Addis Ababa, January 30, 2016. REUTERS/Tiksa Negeri

Zambian President Edgar Lungu speaks before attendees during the 70th session of the United Nations General Assembly at the U.N. Headquarters in New York, September 29, 2015. REUTERS/Eduardo Munoz 

Zambian President Edgar Lungu speaks before attendees during the 70th session of the United Nations General Assembly at the U.N. Headquarters in New York, September 29, 2015. REUTERS/Eduardo Munoz 

11-year-old Sonia Matanga (L), who was born HIV-positive, attends a self-help group meeting with caregiver Davison Mungoni (R) in the village of Michelo, south of the Chikuni Mission in the south of Zambia February 23, 2015. The caregivers in the Jesuit-run home-based care project at the Chikuni Mission run a capacity-building and empowerment project at the household level, offering training and assistance in crop-growing and animal rearing, as well as offering companionship, pastoral care and monitoring antiretroviral treatment compliance of HIV-AIDS patients.
REUTERS/Darrin Zammit Lupi (ZAMBIA - Tags: SOCIETY HEALTH) 

Justina Kabuli and her 12-year-old son Andrew, both HIV-positive, remove weeds from their field of sweet potato crops during a visit by a home-based care team to their home in Chiyobola village, close to the town of Chikuni in the south of Zambia February 21, 2015. The caregivers on the Jesuit-run home-based care team at Chikuni run a capacity building and empowerment project at household level, offering training and assistance in crop-growing and animal rearing, as well as offering companionship, pastoral care and monitoring antiretroviral treatment compliance of HIV-AIDS patients. Picture taken February 21, 2015.
REUTERS/Darrin Zammit Lupi (ZAMBIA - Tags: HEALTH DRUGS SOCIETY AGRICULTURE)