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In page Treaty on Open Skies:
"Russia also uses a Tu-154M-ON monitoring aircraft. Germany formerly used this type as well until the aircraft was lost in a 1997 accident. Russia is phasing out both An-30 and Tu-154M-ON and replacing them with two Tu-214ON with the registrations RA-64519 and RA-64525. This aircraft's new sensor suite, though, is being challenged by the US.[citation needed][2]
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