whomの使い方
下記は、”どちらも戦闘に貢献している国防省とワグナーの間の緊張”の意味だと思いますが、
この中でwhomは両軍を指すと思いますが、これがthemだとおかしいですか。
The ministry said Russia’s situation had likely been worsened by
“tensions between the Russian ministry of defence and Wagner Group,
both of whom contribute troops in the sector”
回答
「both of whom」の「whom」は関係代名詞で、両軍についての情報を追加しています（非限定用法）。それを使わないのなら、いったんピリオドを打って、「Both of them …」または「They both…」と新しい文を始めます。
I have a banana and an apple, both of which came from Texas.
I have a banana and an apple. Both of them came from Texas.
I have a banana and an apple. They both came from Texas.
The ministry said Russia’s situation had likely been worsened by tensions between the Russian ministry of defense and Wagner Group, both of whom contribute troops in the sector.
The ministry said Russia’s situation had likely been worsened by tensions between the Russian ministry of defense and Wagner Group. Both of them contribute troops in the sector.
The ministry said Russia’s situation had likely been worsened by tensions between the Russian ministry of defense and Wagner Group. They both contribute troops in the sector.