This is the 7266th most frequent Japanese word.
中共
"中共" refers to the Chinese Communist Party (CCP).
In this sentence, "中共" is used as a proper noun referring to the Communist Party of China (abbreviation of 中国共産党).
日本と中共の関係は複雑だ。
The relationship between Japan and the Communist Party of China is complex.
Here, "中共" again refers to the Communist Party of China, specifically indicating the entity's policies.
中共の政策が世界に影響を与えている。
The policies of the Communist Party of China influence the world.
"中共" is used in this sentence as the central topic of discussion, referring to the Communist Party of China.