以俄罗斯持续侵犯乌克兰主权和领土完整为由，美国航天局今天告诉其官员，美国航天局将暂停与俄罗斯**代表的所有接触。在Verge获得的一份NASA内部备忘录中，该机构表示，暂停包括前往俄罗斯、召开电话会议以及俄罗斯**官员参观NASA设施。美国宇航局甚至暂停了与俄罗斯官员的电子邮件交流。

不过，正在进行的国际空间站活动不受这一暂停的限制，与俄罗斯以外其他国家举行的包括俄罗斯官员参加的会议也不受此限制。这些指示直接来自国际和机构间关系的机构副署长迈克尔·奥布莱恩（Michael O'Brien）。

一位不愿透露姓名的美国宇航局科学家说：“美国宇航局的目标不是政治性的。”这是我从美国**听说的第一个重大行动之一，它是为了阻止科技合作。。。你是说没有比这更好的了？”

今年3月初，美国宇航局首席执行官查尔斯·博尔登告诉记者，“我们与俄罗斯的关系一切正常”，但自那以后，两国关系似乎一直在恶化。上周，博尔登在博客文章中利用与俄罗斯日益紧张的关系，以抨击国会缺乏空间资金，称美国目前对俄罗斯航天任务的依赖是无法接受的。

以下是备忘录摘录：

Given Russia's ongoing violation of Ukraine¹s sovereignty and territorial integrity, until further notice, the U.S. Government has determined that all NASA contacts with Russian Government representatives are suspended, unless the activity has been specifically excepted. This suspension includes NASA travel to Russia and visits by Russian Government representatives to NASA facilities, bilateral meetings, email, and teleconferences or videoconferences. At the present time, only operational International Space Station activities have been excepted. In addition, multilateral meetings held outside of Russia that may include Russian participation are not precluded under the present guidance.

更新4月2日，下午7:45：美国宇航局已发表声明，确认它正在停止“与俄罗斯联邦的大部分正在进行的活动”，而国际空间站的运行除外。我们复制了下面的声明。

Given Russia's ongoing violation of Ukraine's sovereignty and territorial integrity, NASA is suspending the majority of its ongoing engagements with the Russian Federation.  NASA and Rosco**os will, however, continue to work together to maintain safe and continuous operation of the International Space Station. NASA is laser focused on a plan to return human spaceflight launches to American soil, and end our reliance on Russia to get into space.  This has been a top priority of the Obama Administration’s for the past five years, and had our plan been fully funded, we would have returned American human spaceflight launches – and the jobs they support – back to the United States next year.  With the reduced level of funding approved by Congress, we’re now looking at launching from U.S. soil in 2017.  The choice here is between fully funding the plan to bring space launches back to America or continuing to send milli*** of dollars to the Russians.  It’s that simple.  The Obama Administration chooses to invest in America – and we are hopeful that Congress will do the same.