If US is the leader of the West, Russia is still the leader of the Non-West, namely, everyone else. US is still way too powerful. You either side with them or seek protection from the second largest campaign, that is, Russia. China is still too weak to take on that responsibility, meaning, the balancing of world powers. I am watching some Chinese military channels nowadays. They seem to be a lot more humble and realistic than a few years ago. I like it, because that will improve their credibility both inside and outside of China. Given that the Communist Party of China cannot possibly convince Chinese people that they can defend China for them, they still rely on Russian stories to explain why there is not much to worry about. Just say Russia, and Chinese people will calm down and feel a little more confident. They have been doing this for decades. Hopefully, things will change a little in 10-20 years.
Railguns on stealth destroyers indeed pose a certain threat to China. The best conventional guns cannot possibly fire beyond 3 km/s in speed, but railguns can easily fire beyond 7 km/s in speed, which conveniently translates to hundreds of kilometers in range, if not beyond a thousand. Usually, this is not a problem, because it takes only a missile or a torpedo to sink a warship while it takes a lot of fire power to flatten an area. Navy can never win unless the technological gap between two nations exceeds 20-30 years or the defender is really stupid. So, why worry? Why even mention Russia to comfort Chinese people? Can’t Chinese cruise missiles exceed a couple of thousands of kilometers in range?
Stealth. A stealth destroyer looks like a fishing boat on radars, but in South China Sea or East China Sea there are always lots of fishing boats everywhere. How does a cruise missile know which one to hit? Torpedoes? Railguns are already hitting you. How long does it take a submarine to travel a few hundred kilometers? Do you think a destroyer has enough fire power to keep on firing for a few days? Don’t bother. You need air force. You need a long-range stealth fighter to get there within an hour, possibly a few minutes, and kill that destroyer immediately. J-20 is still not ready for service. Maybe that’s why China is panicking. Don’t worry. Railguns are not ready, either. Let’s see who gets ready first.
Range. Range is everything. Range gives you physical immunity in naval warfare.