On the Mures river in central Romania, French armoured vehicles and Romanian trucks board a motorised floating bridge, part of a large military exercise to showcase NATO's ability to rapidly increase force levels on its eastern flank facing Russia.
The drill -- planned for months and seen as an "integration exercise" for NATO members -- comes after Washington last week said it would pull some troops out from the area.
Romania, which shares some 650 kilometres (400 miles) of border with Ukraine, has gained in strategic importance since Russia invaded its neighbour in 2022.
In the Dacian Fall exercise from October 20 to November 13, French-led troops from Belgium, France, Luxembourg and Spain are engaged in manoeuvres and live-fire artillery and tank drills, together with Romanian soldiers.
Since Moscow's full-scale invasion of Ukraine, Paris has deployed nearly 1,500 soldiers in Romania and doubled them for the exercise. In case of a crisis, this can be increased to 5,000 troops.
"We must demonstrate our ability to integrate into a NATO division," said French General Maxime Do Tran, commander of the 7th Armoured Brigade deployed for Dacian Fall.
The exercise, conducted across Romania, follows "NATO's real defence plans" and serves to signal the alliance's "strategic solidarity", he added.
While French army engineers skilfully dock the massive motorised barge on the banks of the Mures during one exercise, 200 metres (220 yards) away, Romanian engineers speedily put up a pontoon.