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versions of Antares. The 100 and 200 series were built by the Ukrainian companies Pivdenne and Pivdenmash, using refurbished NK-33 engines from the Soviet N1 program on the 100 series and newly built Russian RD-181 engines on the 200 series after the loss of an Antares 130 vehicle in 2014. After Russia's 2022 invasion of Ukraine ended access to these suppliers, Northrop

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