у прикупљању и достављању
This shows the two consonants that correspond to what a Russian would write as ль and нь.
The letter E in Russian is always preceded by either a palatalized consonant, the semivowel /j/, or цчшщ which do not have palatalized/unpalatalized pairs.

Compare Serbian покренут jе меморијални. The /j/ before /e/ is not spelled in Russian, as it is in Serbian, so you have the spelling есть, but with the /j/ pronounced-- /jest'/. Note the /j/ can also occur before other vowels, the /ju/ in жртвују, which is spelled in Russian with a ю, жертвую.