How threatening were the Moskva-class helicopter cruisers?

Did the Royal Navy's submarine service regard the Moskva-class helicopter cruisers as a serious threat?

Yes when they operated as part of a task group, because their helicopter force multiplied the chances of finding a submarine even if each aircraft was individually less capable.

The ships became a significant problem when their helicopters supported a wider task group. Even if individual Soviet helicopters were judged less capable than Western equivalents, repeated patrols created more opportunities to detect and attack a submarine. Threat assessment therefore depended on aviation tempo and group integration, rather than simply the cruiser's hull or missile battery.