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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radar
heavy water radiator
protective screen
graduation tower
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flagUkraine
69%
3%
19%
7%
26
flagthe Netherlands
68%
12%
12%
6%
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flagAustria
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12%
12%
6%
33
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0%
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15%
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flagPoland
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12%
21%
6%
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18%
18%
11%
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flagGermany
48%
12%
24%
11%
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47%
28%
14%
4%
21
flagthe United States
45%
17%
28%
7%
103
flagthe United Kingdom
40%
26%
25%
8%
72
flagSwitzerland
35%
21%
21%
14%
14
flagGreece
26%
26%
40%
6%
15
flagIndia
21%
48%
14%
12%
47
flagCanada
18%
25%
37%
18%
16