Mr Abiy became prime minister in 2018 after mass protests forced his predecessor to resign.
He promise to end authoritarian rule, and introduced sweeping reforms that led to the unbanning of political groups and the release of thousands of prisoners.
The end of state repression also to a surge in ethnic nationalism which spilled over into violence.
Ethnic and political groups which felt suppressed under the former regime demanded more autonomy for their regions, and greater recognition of their language and cultural rights.
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