North Korea should look to protect their own people.
North Korea should take responsibility for protecting their own people.
to look to を使って言う場合：
ーNorth Korea should look to protect their own people.
「北朝鮮は自国民を守ることに目を向けるべきだ」
to look to で「~に目を向ける・関心を向ける」
または次のようにも言えます。
ーNorth Korea should take responsibility for protecting their own people.
「北朝鮮は自国民を守ることに関して責任を負うべきだ」
to take responsibility で「〜に関して責任を負う」
ご参考まで！
カナダ 
