True, a radar used for surface detection are limited by the horizon. Max surface detection range vary from 40- 70 km max. I don't think the Ukrainian surface radar detect the Moskva at all.
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the position of the ship are way above 100+km from Ukraine's shores
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Radars too can't tell if what they're seeing is a bulk carrier or a warship, fortunately for the Ukrainians the Russian warship are operating in a known pattern.
add that to (possible) NATO intelligence sharing + Ukraine's own surveillance and the Ukrainians prolly could guess where the last known position of the Russian ship.
The Argentinians once use this trick to try and sink the British carriers operating near the Falklands combat zone,
On 30 May, two Super Étendards, one carrying Argentina's last remaining air-launched Exocet, accompanied by four A-4C Skyhawks each with two 500 lb (230 kg) bombs, took off to attack Invincible. Argentine intelligence had sought to determine the position of the carriers from analysis of aircraft flight routes from the task force to the islands.
But Royal navy ain't the Russian navy, and British Harrier pilots are ordered a strict EMCON and even stricter procedure to land (diving well below radar coverage to visually identifiy the whereabouts of the carriers)
watch here from 11:15 on how RN naval aviators operate and their technique to land without giving away positions.
Hence no RN carrriers sunk.
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