Frequently in a space launch one of the stages in the rocket is so massive that it will not completely burn up when it reenters the atmosphere. The normal, responsible behavior is to have a controlled burn after the payload is launched which will push the rocket stage into a calculated reentry. This allows the rocket owner to pick the place on the planet the residuals will land, say the middle of an ocean far from routine shipping channels.
The irresponsible strategy is skip the reentry burn which means the massive chunks of unburned metal will land on the earth at some random place, say an occupied area or even a major city.
China is building their own space station. On 4/28/21 they successfully launched the first of three main components.
4/28/21 – Space.com – China launches core module of new space station to orbit – The central component of the space station is called Tianhe, for Harmony of the Heavens. This module is 54 feet long. Two more sections, each of them 47 feet long, will be launched. The basic station will be assembled by the end of 2022.
A Long March 5B heavy-lift rocket launched the space station.
A cargo launch will go to the station next month with three astronauts arriving in June.
This is not the first space station China has put in orbit. The first one, Tiangong-1, back in 2011 had visits from two crews of three astronauts each before it reentered the atmosphere and was burned up.