According to the Wednesday statement, al-Nusra Front militants "also shelled the positions of the Syrian army in the region of Marj al-sultan [north of Damascus]."
The Russian center for Syrian reconciliation stressed that Jabhat al-Nusra continues provocations aimed at disrupting the ceasefire regime in Syria.
Syria has been mired in civil war since 2011, with government forces loyal to Syrian President Bashar Assad fighting numerous opposition factions and extremist groups.
A US-Russia-brokered ceasefire agreement came into force across Syria on February 27. The deal does not apply to terrorist groups such as Islamic State (ISIL, also known as Daesh) and al-Nusra Front, both of which are outlawed in Russia and a range of other states.