It may not have a major impact on these companies, but represents a growing willingness by China to play tit-for-tat with the US.

Not just military companies. Ban their civilian companies who are also banning our imports.

United States and Chinese flags are set up before a meeting between U.S. Treasury Secretary Janet Yellen and Chinese Vice Premier He Lifeng at the Diaoyutai State Guesthouse in Beijing, China, Saturday,

Beijing has issued an additional series of sanctions against seven US companies that it added to its "Unreliable Entity List" for selling arms to Taiwan.