The United States has provided intelligence and helped Ukrainian forces kill many of the Russian generals who have died in the Ukraine war, the New York Times reported on Wednesday.

The New York Times reported that Washington has provided to Ukraine details on Russia’s expected troop movements and the location and other details about Russia’s mobile military headquarters, and Ukraine has combined that help with its own intelligence to conduct artillery strikes and other attacks that have killed Russian officers.

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It is reported that Ukrainian soldiers have killed about 12 Russian generals on the battlefield. However, the US officials declined to specify how many generals had been killed as a result of American intelligence.

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Meanwhile, on Wednesday, Russian officials said its forces had practised simulated nuclear-capable missile strikes in the western enclave of Kaliningrad, amid the ongoing military operation in Ukraine.

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The announcement came on the 70th day of Moscow’s military action in the pro-Western country, with thousands killed and more than 13 million displaced in the worst refugee crisis in Europe since World War II.

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After sending its troops to Ukraine in February, Russian President Vladimir Putin has made thinly veiled threats hinting at a willingness to deploy Russia’s tactical nuclear weapons.

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On Wednesday, Russia practised simulated “electronic launches” of nuclear-capable Iskander mobile ballistic missile systems, the defence ministry said in a statement.