"They were preparing assassinations ... as the beginning of capturing the territory, separation of Odesa from Ukraine," Nalyvaichenko said at a briefing in Kyiv on Thursday.
The head of the Security Service said that the saboteur's action plan was similar to that implemented in the Donbas which resulted in "DPR" and "LPR".
According to him, these people were preparing assassinations of a people's deputy and Odesa activists. Nalyvaichenko did not specify the names of the detainees' potential targets.
"We have arrested 29 people, including four organizers of the criminal separatist organization," Nalyvaichenko said and added that most of the detainees are citizens of Ukraine.