国家の安全保障は最重要課題だ

N3 国家 kokka state, country, nation N4 安全 anzen safety, safe, secure N3 保障 hoshou guarantee, security, warranty N3 重要 juuyou important, essential, significant N3 課題 kadai task, assignment, issue

N2 課 ka chapter, lesson, section N4 題 dai topic, subject, sujet

N5 〜の no Indicates possession, relation between nouns, nominal explanation, or turns a verb into a noun phrase N5 〜は wa Marks the topic of the sentence, indicates what the sentence is about, can contrast with another element, organizes main information