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
flagAustria
63%
15%
10%
10%
19
flagthe Netherlands
58%
16%
16%
8%
12
flagPoland
57%
12%
22%
7%
3804
flagGermany
52%
12%
20%
11%
155
flagRepublic of Ireland
52%
13%
21%
13%
23
flagAustralia
50%
30%
15%
0%
20
flagthe United States
41%
16%
31%
10%
80
flagthe United Kingdom
41%
28%
24%
5%
53
flagSwitzerland
41%
25%
16%
8%
12
flagGreece
26%
26%
40%
6%
15
flagIndia
23%
44%
15%
15%
38
flagCanada
16%
25%
41%
16%
12