Isabel dos Santos, nicknamed Africa's wealthiest woman, under investigation for alleged irregularities involving state companies, including the OPEC nation's giant state oil company Sonangol.
Nicolas Sarkozy faces preliminary charges of illegally funding his successful 2007 campaign, passive corruption and receiving money from Libyan embezzlement.
Lee, a conservative who governed from 2008 to 2013, is the latest South Korean leader to be entangled in scandals or other problems after leaving office.
Teodorin Obiang, eldest son of President Teodoro Obiang and a vice-president himself, denies charges of laundering embezzled public funds, for which he risks a sentence of 10 years in jail and huge fines if convicted.
A judge on Wednesday handed down a five-year suspended sentence to opposition leader Alexei Navalny, threatening his plan to run for president in 2018.
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