訓 くに ・ 音 コク
漢越音: quốc
玉 (jade treasure) sealed inside 囗 (a border wall): precious things guarded within a boundary. That is exactly a country.
Stroke data: KanjiVG (CC BY-SA 3.0) — kanjivg.tagaini.net
どこの国から来ましたか。 (どこのくにからきましたか)
Which country are you from?