Drones sent into North Korea earlier this year were initially denied by Seoul.
President Lee described the actions as 'unnecessary' and 'irresponsible.'
A probe revealed government officials' involvement in the drone incidents.
Strategic angle: President Lee Jae Myung expresses regret over the government's involvement in drone incidents with North Korea.
Drones sent into North Korea earlier this year were initially denied by Seoul.
President Lee described the actions as 'unnecessary' and 'irresponsible.'
A probe revealed government officials' involvement in the drone incidents.