MOSCOW—Russia is struggling to meet demand for its Sputnik V vaccine, compounding a supply crunch for the shots in the developing world as Covid-19 infections surge in many poorer countries.
More than 60 countries have approved the Sputnik V shot and Moscow has struck deals to sell more than 630 million doses, according to analytics company Airfinity, which tracks global vaccine distribution.
Those doses are especially important to the developing world, as multilateral efforts to supply poorer countries have stumbled badly in recent weeks—a development that has opened the door to Russian- and Chinese-made vaccines.
But Russia is late on some deliveries and analysts tracking the rollout say it lacks global production capacity to fill the orders. So far, it has delivered only about 15 million doses.
Mexican and Argentine authorities have reported delays in shipments of the vaccine’s second dose, which takes longer to produce, leaving them…