What was the function of this colossal structure near Chernobyl?

radar
heavy water radiator
protective screen
graduation tower
Duga was a Soviet over-the-horizon radar system used as part of the Soviet anti-ballistic missile early-warning network. The system operated from July 1976 to December 1989. Two operational Duga radars were deployed, one near Chernobyl in the Ukraine and the other in eastern Siberia.
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reach: rather globalCold WarradarsSoviet UniontechnologyUkraineUSSR

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radar
heavy water radiator
protective screen
graduation tower
answers
flagUkraine
69%
3%
19%
7%
26
flagAustria
66%
11%
11%
11%
18
flagthe Netherlands
58%
16%
16%
8%
12
flagPoland
57%
12%
22%
7%
3703
flagGermany
53%
11%
20%
11%
139
flagRepublic of Ireland
45%
15%
25%
15%
20
flagthe United Kingdom
41%
29%
23%
5%
51
flagAustralia
41%
35%
17%
0%
17
flagSwitzerland
41%
25%
16%
8%
12
flagthe United States
40%
17%
32%
9%
74
flagGreece
28%
21%
42%
7%
14
flagIndia
21%
45%
16%
16%
37
flagCanada
9%
27%
45%
18%
11