Relations between the USA and Turkey have soured following the purchase by Turkey of a Russian missile defense system. Turkey received the first deliveries of the Russian-made S-400 missile defense system on Friday. The USA had warned Turkey not to buy defense equipment from Russia. The USA and Turkey are both allies in NATO - a defense organization created in 1949 to counter any possible military aggression by Russia. NATO consists of 29 North American and European nations. The USA has the biggest military among the member states. In recent years, Turkey has been establishing closer ties with Russia. This has caused security concerns for the USA and other NATO member countries.

土耳其购买俄罗斯导弹防御系统后，美国和土耳其的关系恶化。上周五，土耳其收到了俄罗斯制造的S-400导弹防御系统的首次交付。美国警告土耳其不要从俄罗斯购买防御设备。美国和土耳其都是北约的盟国，北约是1949年成立的一个防御组织，旨在对抗俄罗斯可能的任何军事侵略。北约由29个北美和欧洲国家组成。美国在成员国中拥有最大的军队。近年来，土耳其与俄罗斯建立了更密切的关系。这引起了美国和其他北约成员国的安全担忧。

The U.S. has warned Turkey it will face economic sanctions if it goes ahead and installs the S-400 defense system. It also said Turkey would not be allowed to play any part in a program to manufacture the USA's high-tech F-35 fighter jets. The U.S. wants Turkey to buy its Patriot missile defense system instead. U.S. officials argue the Russian system would be incompatible with NATO systems and would expose F-35 fighter jets to possible Russian subterfuge. Turkey said the S-400 would not be integrated into NATO systems and would not pose a threat to the NATO alliance. Turkey's president said the decision to purchase the S-400 system did not mean it is seeking "alternatives" in its relations with the West.

美国警告土耳其，如果土耳其继续安装S-400防御系统，它将面临经济制裁。该公司还表示，土耳其将不被允许在制造美国高科技F-35战斗机的计划中扮演任何角色。美国希望土耳其购买其爱国者导弹防御系统。美国官员辩称，俄罗斯的系统将与北约的系统不兼容，并将使F-35战斗机暴露在俄罗斯可能的诡计之下。土耳其表示，S-400不会被纳入北约系统，也不会对北约联盟构成威胁。土耳其总统说，购买S-400系统的决定并不意味着它正在寻求与西方关系的“替代方案”。