U.S. officials are seeing a failure rate of up to 60% for some of Russia’s precision-guided missiles being used in the assault on Ukrainian cities, according to a report on Thursday.

Failures can include such mishaps as a missile failing to launch or a missile not exploding on impact. Russia’s air-launched cruise missiles have failed at a rate of 20% to 60%, depending on the day, according to unnamed U.S. officials in the report.

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