Kiev (AFP) - Ukraine is rethinking its truce with rebels holding parts of the east of the country because separatist elections "violated" the agreement, President Petro Poroshenko said Monday.

"These pseudo-elections are a gross violation of the September 5 Minsk protocol," he said in an address to the nation, vowing to "re-examine" Kiev's commitments to the truce deal.

"We should reexamine our action plan. I have discussed it with the defence minister," he said, adding that he would hold a high-level meeting of security and defence chiefs on Tuesday.

Poroshenko said he is proposing to abolish a law agreed under the truce deal that grants a certain level of autonomy for three years to the rebel strongholds of Donetsk and Lugansk regions.

That self-rule offer was meant to mobilise support for the peace deal, said Poroshenko, but Sunday's separatist elections have "put in great jeopardy the entire peace process" and "significantly worsens the situation in Donbass".