Such illogical and brazen-faced behavior of south Korea is exactly the same as the gangster-like logic of ....

金与正氏が韓国大統領非難　肩書は「党宣伝扇動部副部長」 2021.3.30

「鉄面皮ぶりに驚きを禁じ得ない」と批判。「非論理的で厚顔無恥な態度は、われわれの自衛権を国連決議違反だの国際社会への脅威だのと言い掛かりをつける米国の強盗のような主張そっくりだ」と述べた。

We can hardly repress astonishment at his shamelessness.

He doesn't have even the elementary logic and face.

Such illogical and brazen-faced behavior of south Korea is exactly the same as the gangster-like logic of the U.S. faulting the right of the DPRK to self-defence as a violation of the UN "resolutions" and "threats" to the international community.

【鉄面皮】

面(つら)の皮がまるで鉄でできているように、恥知らずで厚かましいこと。厚顔無恥。

国際政治やっていくには、韓国にせよ、北朝鮮にせよ、米国にせよ、鉄面皮は必要なんだろうね。