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07183528 �SERGEY DOLZHENKO/EPA/MAXPPP CHERNOBYL 20181122 Visitors walk past of the remains of the over-the-horizon radar system 'Duga' not far from city of Chernobyl, Ukraine, 22 November 2018. The over-the-horizon radar system Duga is placed not far of Chernobyl and was a part of the former Soviet Union missile defense radar network with early warning which operated to 26 April 1986 and stopped after the Chernobyl Nuclear Power Plant disaster. The explosion of Unit 4 of the Chernobyl nuclear power plant in the early hours of 26 April 1986 is still regarded as the biggest accident in the history of nuclear power generation.