Symfony2 validation messages translation. Fallback option does not works

Symfony2 validation messages translation. Fallback option does not works

I have SF2.3 at my webserver. I am using validatorBuilder to validate my
data.
Here is my config:
framework:
translator: { fallback: ru }
default_locale: ru
Here is my event listener:
// EventListener.php
...
$validator = Validation::createValidatorBuilder()
->enableAnnotationMapping()
->getValidator();
But when I get error messages they are in english, not in 'ru' locale.
What am I doing wrong?