However, the Indian Army did not cross the border during the operation, they said.
Without Myanmar, India can't engage with any of the Asian nations to its east.
The central government was aware of illegal immigration in Mizoram and would take measures to check it, Congress President Sonia Gandhi said on Monday.
The development of the Rih-Tiddim road and establishment of numerous rural "haat" (flee markets) along the Mizoram-Myanmar border would also increase the trade volume, Modi said while addressing a public meeting at the Assam Rifles ground here after inaugurating the 60-MW Tuirial hydro-electric power project.
In a 35-minute address to the Indian diaspora, the prime minister said that his government was not afraid of taking "big" and "tough" decisions in the interest of the country.