MOSCOW, October 6. /TASS/. Russian President Vladimir Putin and Swiss President Didier Burkhalter, who is Chairman of the Organziation for Security and Cooperation in Europe (OSCE), stress the importance of adherence to agreements reached by Contact Group on Ukraine in Minsk, the Kremlin said on Monday.

Putin and Burkhalter have agreed that a thorough probe should be carried out into the Malaysia Airlines Flight MH17 crash and mass graves of civilians in Ukraine’s south-east.

The two presidents also hailed the work of the OSCE Special Monitoring Mission to Ukraine, “stressing a need to augment its potential,” the Kremlin press service added.

The two leaders also focused on safety assurances for OSCE observers in Ukraine ahead of Ukraine's October 26 parliamentary election as Putin expressed condolences over the death of an International Committee of the Red Cross (ICRC) Swiss worker in the troubled territory.

Etienne Du Pasquier, 38-year-old administrator at the ICRC’s Donetsk office, was killed by shelling near his office on October 2. He came to Ukraine six weeks before, and previously worked in Pakistan, Yemen, Haiti, Egypt and Papua New Guinea.