Russia & China Not Using mRNA Injections While Countries Highly Injected Showing Increased Hospitalizations & Deaths

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Why do you suppose Russia and China are not implementing the mRNA injections, and why are the most injected nations such as Israel and Britain still suffering the most? Regions in India (such as Delhi) are seeing low infection rates because Ivermectin is widely prescribed whereas other regions there (such as Tamil Nadu) are suffering high infection rates where Ivermectin is not being widely prescribed?