Originally Posted by the_13th_redneck

Cutting edge military tech from Russia always has a few central themes:
1) Only a handful of them were built due to lack of funds and hopes to attract customers from abroad to make ends meet.
2) Only one prototype flew until the program was scrapped due to lack of funds.
3) It was mothballed at the design stage when it was deemed there was a lack of funds for such a project.