 On 27 June 1997 a $1-million payment was received by Lissouba's South African partner, who in turn delivered two Mil Mi-17 helicopters to Lissoba's troops.On 11 July 1997 the Congolese government paid a total of $7.7 million for the 28 helicopters.In October 1997, having ousted Lissouba and assumed power, Sassou-Nguesso sent invoices to Exotek stating that all contracts and payments remained in force.