Ukrainian President Petro Poroshenko said he was about to sign an order for a temporary unilateral ceasefire by Ukrainian forces in the east of the country, the interior ministry's website said.
As the president said, he will shortly sign a decree for a temporary ceasefire.
This is being done so that terrorists can put down their arms.
Those who do not do this will be eliminated.
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It comes after security was stepped up around the country following the Manchester Arena attack which killed 22 people.
A murderer nicknamed 'Houdini' after escaping the death penalty seven times has been given the lethal injection.
The distress signal sparked a police hunt in the area to find the person or group who made it.