As separatists in eastern Ukraine push ahead with a referendum on self rule, security officials in Kiev say they will do everything they can to block it.
Those behind Sunday’s planned poll – on independence for the Donetsk and Luhansk regions – are ignoring a call from Russian President Vladimir Putin to postpone the vote.
The security services say they will continue to crack down on those suspected of being part of the separatist movement.
“Today and tomorrow, authorities and law enforcement agencies will be doing everything possible to stop the financing of this so-called referendum,” Valentyn Nalyvayshenko, Head of Ukraine’s SBU Security Service, told reporters.
“Law-abiding civil organisations will not take part in it.”
The determination of separatists to go ahead with the vote is stoking concerns in the west, where there is a fear that it will tear Ukraine apart.