LATAKIA (Sputnik) — The airstrike took place in the northern Syrian town of Anadan, around 12 km (7.5 miles) north of Aleppo, according to the news outlet.
The name of the militant leader has yet to be released.
After Moscow commenced its anti-IS aerial operation in Syria in late September, units of the Syrian army intensified their offensive and had liberated some parts of country from the terrorists' hold.
Syria has been mired in a civil war since 2011, with the government army fighting opposition factions and terrorist groups, such as the Islamic State and the Nusra Front.
On September 30, Russia began an anti-terrorist air campaign in the country at the request of President Bashar Assad.