Neither the post nor the comment limited themselves to the EU. Europe as a whole (10,014,000 km²) is in fact very slightly larger than the US. In this context you could argue that neither USA’s Alaska nor all the barren tundra in Europe should really count, then the contiguous 48 could be bigger depending on how how much of Russia you leave out.
The United States (9,826,630 km2 / 3,794,080 sq mi) is larger than the European Union (4,233,262 km2 / 1,634,472 sq mi)
Neither the post nor the comment limited themselves to the EU. Europe as a whole (10,014,000 km²) is in fact very slightly larger than the US. In this context you could argue that neither USA’s Alaska nor all the barren tundra in Europe should really count, then the contiguous 48 could be bigger depending on how how much of Russia you leave out.
China, about 9.7M km2
Edit: is your size source right? I found somewhere that says China is 9.7M km2 vs US which is 9.3M km2
https://www.worldometers.info/geography/largest-countries-in-the-world/