Sounds like China realized that they don’t have any combat experience and now some people are volunteered to gain some experience for the invasion of an unspecified island…

PC30

This means RS30 and it might be a Russian designation for Multiple Rocket launchers, not 100% sure about this.

ВСУ is actually VSU (or WSU for Germans), but it does mean Armed Forces of Ukraine

Are there not valuable targets closer to Ukrainian territory?

This would allow the Russians to concentrate their air defense close to Ukraine. Striking targets far beyond the front forces the Russians not only to spread their air defense thin, but they also have to decide which sites they leave undefended. Pulling their air defense away from the front, it also means that Ukrainian F-16s and other planes will have more freedom to operate in the region.

And the strategic reason has already been mentioned: Striking targets like refineries makes the war more costly to the Russians, it deprives them of income, they possibly can’t repair them because of sanctions, a.s.o. And obviously you want to bring the war to your enemy’s territory because the enemy is already creating lots of destruction in your country.

Russia is so lame… This is like those Twitter users who post something and then reply to themselves agreeing but forgot to login as their alt-account.

Because a tank factory is a strategic target which you would use ballistic/“hypersonic” missiles for. Well aside from the propaganda value that a German tank factory was destroyed. You can safely assume that the Russians are going to use their better stuff for that factory instead of firing at civilian buildings or train stations with refugees.