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| Russian | English |
| стать тревожным "звоночком" | raise red flags (4uzhoj) |
| тревожный звонок | warning shot (to ... – для ...; New York Times; a ~ Alex_Odeychuk) |
| тревожный звонок | bite of the reality sandwich (Interex) |
| тревожный звоночек | red flag (There is always a chance that unforeseeable circumstances happen, which can cause rescheduling and longer response times, but if this is happening consistently, it should be a red flag and taken with great caution moving forward. 4uzhoj) |
| тревожный признак | red flag (Alexander Demidov) |
| тревожный сигнал | red flag (Дмитрий_Р) |