I really wish I had thought of this earlier, the Soviet 1991 August coup succeeds, i.e. they arrest Yeltsin as originally planned, and the cold war heats up and then continues for another decade or so.
For example:
F-22, Typhoon, Rafale etc. proceed to their original schedules, enter service in the mid to late 90s and are mass produced
A-12 and other advanced platforms are not cancelled (no F/A-18E/F/G)
MV-22 is pushed into service earlier
AAAV (EFV) is deployed.
140mm NATO tank guns
Mass production of Seawolf SSNs
Basically no peace dividend, no massive cut back in defence spending or delay / cancelation of projects until a decade or more later. Lots of the fanciful and real stuff on both sides is built and replacement projects started.