And this isn't the only "prediction" he wrote in his many books, and even video games... he had a part in...
Incredible...
Like his prediction of Japan (with cooperation from China) going to war with the United States- and the Jack Ryan character becomes the leader of the free world when the US government had been wiped out by the Japanese with a suicide plane crashing into Washington D.C.
I never found his insights particularly compelling, often very non-specific details but the overall stories could be either hit or miss on the realism scale, some just completely in the realm of alternate reality fantasy. Many other things aren't so much predictions as they are gleaning from world events and writing a story from them. The conceit of Russian nationalism embittered by the NWO led by old school politicians trying to reshape lost republics and CIS states and fold them back into a 'new' USSR isn't unique to Clancy at all.
The airliner crashing into Washington DC wiping out Congress for example is similar to the 9/11 attacks, but he apparently gets lucky on that one, his novel assumes state actors rather than a terrorist plot by Islamists.