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The W-88 in a shipping container is a complete waste of technology. Anyways, we can now detect this type of incursion if we get serious with detection apparatus, which includes not just geiger counters, but 'sniffers' that are extrordinarily sensitive. Meanwhile, your fear of their being W-88s in containters is misplaced. Its compactness is optimized for MISSILE DELIVERY. China already knows how to build powerful H-Bombs. What the W-88 gives them is the potential to MIRV successfully, and gain a potential for a huge pre-emptive counter-force missile fleet. It's design also uses much less bomb-grade uranium or 'SNM' special nuclear material and hence allows them to proliferate on the cheap. Both the Soviet Union and the US had originally done it the hard way.

You aren't thinking like the Chinese though. China is probably using the small design technology to perfect a backpack nuke for terrorist use on American cities.