I think the Japanese government has to deal with diplomatic issues more intently.
I don't think the Japanese government is very good at dealing with foreign affairs.
この場合、次のような言い方ができますよ。
ーI think the Japanese government has to deal with diplomatic issues more intently.
「日本政府はもっと真剣に外交問題に向き合向き合わなけれいけないと思う」
ここの「外交問題」は diplomatic issues のように言えます。
ーI don't think the Japanese government is very good at dealing with foreign affairs.
「日本政府は外交があまり得意ではないと思う」
ここの「外交」は foreign affairs と言えます。
ご参考まで！
カナダ 
