Kenya will command the joint regional force, which will also include soldiers from Burundi, Uganda and South Sudan.
Paul Gicheru had been accused by ICC prosecutors of running an "egregious and damaging" witness tampering scheme that made it impossible to pursue allegations against President William Ruto.
Kenya's top court dismissed all issues challenging the August election results, which delivered victory to William Ruto against challenger Raila Odinga, who had alleged fraud in the poll.
Kenyan police fire tear gas at angry demonstrators who allege vote-rigging after Deputy President William Ruto was declared the winner of the country's presidential election.
Kenyans are praying for a peaceful transition of power after almost a decade under President Uhuru Kenyatta, but concerns about vote-rigging linger.
The Supreme Court ruled that the "the constitution amendment bill of 2020 is unconstitutional," dealing a blow to President Uhuru Kenyatta and his allies ahead of key elections in August.
International Criminal Court Judges announce mistrial in Kenyan Deputy President William Ruto's case, throwing out charges he faced over post-election violence, which left some 1,300 people dead
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