Soldiers scramble through trenches under a haze of yellow smoke, machine gunfire booms across the fields, invisible drones buzz overhead and voices scream in Ukrainian "Watch out!"

The French military force is training a whole new brigade of several thousand Ukrainian troops who will be joining the fight against Russia’s invasion armed with France-supplied tanks, artillery canons and other heavy weaponry.

France's "Champagne" task force focuses on advanced combat tactics, trench warfare and coordination with artillery and tanks.