The Yak-1000 was a high-speed research aircraft. It was the smallest aircraft that could be built around the powerful AL-5 engine, with a tubular fuselage, a circular nose intake, short-span cropped-delta wings, and bicycle landing gear. The outcome of high-speed taxing trials was such that it was not attempted to fly the Yak-1000.
Only one example was built, and it never flew.

Books:
Yakovlev Aircraft Since 1924 (Putnam's
Russian Aircraft) byBill Gunston, Yefim Gordon
Buy from Amazon.co.uk
Yakovlev, Yak-25/-26/-27/-28: Yakovlev's Tactical Twinjets from Amazon.com
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References:
http://www.topedge.com/panels/aircraft/sites/gustin/sov/YAK1000Y.html
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Updated: Sunday 28th, May, 2006