This is the 4004th most frequent Russian word.
контрнаступление
Counteroffensive.
Here, 'контрнаступление' is used as a noun referring to military strategy.
Армия начала контрнаступление на территории противника.
The army began a counteroffensive on the enemy's territory.
The word 'контрнаступление' is describing the event of reclaiming territory.
В ходе контрнаступления были отбиты ключевые позиции.
Key positions were reclaimed during the counteroffensive.
In this case, 'контрнаступление' points to a planned action or strategy.