Ukrainian President Petro Poroshenko fears that fighting may again escalate in Ukraine's south-eastern regions soon.

"The threat of war is still hanging over us. It is our reality. War may erupt at any moment, but we are prepared to do everything we can to erase any possibility to doubt or retreat," Poroshenko told an international conference in support of Ukraine in Kyiv on Tuesday.

"A solution to the situation in Donbas will be found with your assistance and with your solidarity with us," the president said.

The peace agreements for Ukraine, reached at talks in the Belarusian capital Minsk in February, should be implemented in full via coordination by Ukraine's partners, he said.

"We will not let anyone grow tired of Ukraine," he added.