You just need a stronger first stage booster after all.
Russia's Bulava has a sharper head than both JL-2A and Trident II, but the sharper head will have less room for the MIRVed warheads.
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currently only usa has deployed mirv missiles. russia has developed it but is currently upgrading missiles. china has proven it but still developing and will soon upgrade. i guess india should should prove it as soon as possible.