由于安全原因不明,俄罗斯限制三个机场的航班。 Russia restricts flights in three airports due to unspecified safety concerns.

俄罗斯联邦航空运输局出于安全考虑,对俄罗斯Kazan、Nizhnekamsk和Ulyanovsk三个机场的民用飞机降落和起飞实行暂时限制。 Russia's Federal Air Transport Agency has imposed temporary restrictions on the landing and takeoff of civil aircraft at three airports in Russia—Kazan, Nizhnekamsk, and Ulyanovsk—due to safety concerns. 在接到进一步通知之前,限制措施将保持不变。 The restrictions will remain in place until further notice. 未具体说明这些限制的确切理由。 The exact reasons for the restrictions are not specified.