Operational lessons from the loss of Moskva

What should modern navies learn from the loss of the cruiser Moskva?

Modernize and equip the ship, train and rest the crew, and never assume the enemy lacks the reach to strike.

The lessons are basic but severe: do not send an inadequately upgraded, equipped, or trained ship into a war zone. Commanders must not assume that the enemy lacks the reach to strike merely because previous operations felt safe. Crew fatigue compounds material failures by reducing the ability to keep a difficult ship working. Readiness therefore depends on modernization, threat assessment, training, and sustainable workload rather than any one defensive system.