What is significant about the power that russian federal cities are granted?

A federal city is a city which is a separate entity. It has a status of both: an inhabited locality and a federal subject.

There are three federal cities in Russia: Moscow, Saint Petersburg and Sevastopol in the disputed region of Crimea.

All three cities have federal importance and federal power. Parts of those cities are highly important government/military areas with very restricted settlements rights.

The federal power is seen most in federal representation. A federal city has its own members in the Federal Council, its own legally elected legislature and elected/appointed executive authority. A federal city can create its own laws, has its own taxation power and the power to subdivide the city in smaller municipalities. It has many special privileges which ordinary cities don't.

china unilaterally claims the entire south china sea as sovereign territory, then builds artificial islands to bolster its claim. it suddenly activates an air defense identification zone over the east china sea, and threatens to down any aircraft that does not report its position. it builds roads into indian territory, then redraws the maps to show that it is actually chinese territory. the people's republic under president xi jinping is quickly becoming the bully of asia.

the correct answer is: the fact that the anti-federalist papers were considered poorly written.