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The R-73 is an infrared homing (heat-seeking) missile with a sensitive, cryogenic cooled seeker with a substantial "off-boresight" capability:

Seeker can detect targets up to 40° off missile's centerline. It can be targeted by a helmet-mounted sight (HMS) allowing pilots to designate targets by looking at them...
https://en.m.wikipedia.org › wiki
R-73 (missile) - Wikipedia

To better protect Ukraine. All Ukrainians must support their army. Like the timing of sinking of Russian amphibious ship, the Caesar Kunikov by Ukraine is significant as it was an important logistical ship, Commander of the Commander of the Estonian Nav Jüri Saska said on Wednesday. It is "remarkable" that Russia let such an important vessel sail alone, he said. Saska said that amphibious ships and other logistical bases moving in the Black Sea are a target for Ukraine.

"There's certainly a lot of luck, also very clearly targets being chased, and those are, if you look at the pattern. 

This ships are providing logistical support has also come out into media saying this ships carry upto 500 tonnes of ammunition, b'cos these are very important sea bridges for Russians themselves to supply front," he said.

Saska said Caesar Kunikov was part of the logistical chain and supplied Russian units on the front line in Ukraine. "That's why this is a big loss for Russia, no doubt. It can take 500 tons of ammunition, food and whatever else is needed on the front, and Russians don't have too many of those ships.  

It will take up to five years to rebuild and to build one of these ships, the conditions Russia is in at the moment, it's not so likely they will be rebuilt. Of course, this is a great loss," he explained.

While, Estonian firm BWB leading EU autonomous warship prototype development. Commander said it is not currently possible to send new ships to the Black Sea. "That's why it's actually quite remarkable such a large base, a logistically very important base, moved alone," he added.

Sea drone attacks are difficult to spot because they move in the dark and, due to the cold water, cannot be seen by the ship's infrared cameras, he said.

"The drone comes in the dark. /.../ And you're looking with an infrared camera, you're observing around, you're scanning the surface, these ships are not very well equipped with devices like thermal imaging is essentially non-existent, they're in cold water, probably been there for a long time."

Ukraine's armed forces said the ship had been sunk on Wednesday morning, the BBC reported.
https://news.err.ee/1609253928/saska-rus...tics-chain