Yuan's (who makes a lot of video on both Chinese scientific advancement as well as strategic deterrence") latest video on PLARF and particularly the sale of DF-3 to Saudi Arabia decades ago and the more recent sale of DF-21.
Interesting question he posses at the start of the video: if it takes 30 minutes for ICBM to land after launch, and it takes 1 hour to fuel up DF-5, and DF-5 are based in giant silos which are dead obvious from space and sure to be hit among the first targets in a nuclear exchange than how can one be so sure in that DF-5 will safely be launched prior to their silos being hit?
Only possible answer: to launch first
I've always thought R-36 was a beast of a missile and with a similar silo-based, liquid fuel set up is only intended for first strike. Looking up the size DF-5 is actually pretty comparable to R-36. Consider that when you consider the "no first use" policy of China.
![ICBM_Comparison.jpg ICBM_Comparison.jpg](https://www.sinodefenceforum.com/data/attachments/62/62882-e2c5f440d6531d3386c0ca3973c85876.jpg)
DF-5 is the tallest guy in that line up, R-36 are the two on the far left.