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by nabla9 3017 days ago
It's combination of priorities, capabilities and money. If Russia can maintain credible second strike capability that survives the first strike, detecting attack is not necessary. Russia chose to develop new second strike weapons that survive surprise first strike with the limited resources it has.

Nuclear long range torpedo and Nuclear powered cruise missile that Russia is developing is just that kid of weapon. They are relatively easy to hide and incredibly difficult to intercept (U.S. had similar development in 60's. Google: Project Pluto and SLAM)