### Russian: Эти иногда сопровождавшиеся насилием протесты были вызваны непроведением выборов, некоторые из которых должны были состояться ещё в 2011 году.
### English: These sometimes violent protests were triggered by the success to hold elections, some of which were due as early as 2011.
### Errors: There is a critical word change to antonym error in the English translation.

### Improved English: These sometimes violent protests were triggered by the failure to hold elections, some of which were due as early as 2011.
