The incident occurred just hours after the latest ceasefire, the so-called "harvest truce", was announced.

Four servicemen who were part of the Joint Forces on a mission in the Donbas warzone were killed as they stepped on an explosive device planted by an enemy subversion group, that's according to the report by the JFO HQ.

The two soldiers died on the spot, the report says, adding that another two military were injured in the blast and rushed to the nearest hospital.

The incident occurred in the area of the settlement of Shchastia.

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The JFO Command expressed their condolences to the families of the fallen troops.

As UNIAN reported earlier, from 00:01 on July 21, another ceasefire has come into force, as reported by the press center of the Joint Forces Operation HQ.

"In pursuance of the decision taken in Minsk following the Trilateral Contact Group meeting, from 00:01 Kyiv time on July 21, 2019 the 'silence regime' is being set up along the entire line of contact in the JFO zone in Donetsk and Luhansk regions, which provides for a mutual ceasing of any weapons' fire," the report says.

Units of the Joint Forces will "adequately respond" to enemy shelling in case the invaders violate the ceasefire regime.

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"According to the Ukrainian legislation, Joint Forces are entitled and obliged to protect life and health of military personnel and civilian population, and to prevent territorial losses,” says the report.

As UNIAN reported earlier, on July 18, the representative of Ukraine in the TCG's political working group, Roman Bezsmertnyi, announced that an agreement had been reached on the "harvest truce" to be introduced from 00:01 on July 21, which for the first time prohibits any fire, and envisages responsibility for violating the deal.