On May 21, 2020, U.S. Secretary of State Mike Pompeo announced that the United States would withdraw from the Treaty on Open Skies. The treaty, which has been ratified by several former Soviet Republics and most North Atlantic Treaty Organization (NATO) members, allows states parties to conduct observation flights over each other's territory to build trust and transparency with respect to arms control. The treaty gives state parties a right to withdraw upon six months of notice, which Pompeo stated would be formally given by the United States on May 22. Pompeo described the U.S. withdrawal as a response to Russian violations of the treaty and held open the possibility that the United States would rescind its notice of withdrawal in the event of full Russian compliance. U.S. allies in Europe reaffirmed their own commitment to the treaty and to working with Russia over disputes arising from it. The announced U.S. withdrawal raises significant issues of U.S. domestic law, as the Trump administration did not comply with preconditions to withdrawal that had been established by Congress in the National Defense Authorization Act for Fiscal Year 2020.

中文翻译：

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美国发出退出开放天空条约的通知

2020年5月21日，美国国务卿蓬佩奥宣布美国将退出《开放天空条约》。该条约已获得多个前苏联加盟共和国和大多数北大西洋公约组织 (NATO) 成员国的批准，允许缔约国在彼此领土上空进行观察飞行，以在军备控制方面建立信任和透明度。该条约赋予缔约国在提前六个月通知后退出的权利，蓬佩奥表示，美国将于 5 月 22 日正式给予退出。蓬佩奥将美国的退出描述为对俄罗斯违反该条约的回应，并持有以下可能性：如果俄罗斯完全遵守，美国将撤销其撤军通知。我们 欧洲盟国重申了他们对条约的承诺，并与俄罗斯合作解决由此引起的争端。美国宣布的退出引发了美国国内法的重大问题，因为特朗普政府没有遵守国会在 2020 财年国防授权法案中规定的退出先决条件。