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In page Partial Nuclear Test Ban Treaty:

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A notable atmospheric release of radioactive gas followed the Soviet Chagan test of 15 January 1965 in present-day Kazakhstan. Roughly 20% of the radioactive debris produced by the 140-kiloton detonation was released into the atmosphere, with some fallout occurring over Japan.[5] The US complained to Moscow, but no subsequent action was taken.[citation needed] On 25 April 1966, the Pin Stripe underground test in Nevada (part of Operation Flintlock) experienced a venting malfunction and produced a radioactive plume headed towards the Midwestern United States; the AEC determined that the test did not threaten human health.[2]