Not to mention there were no real winners in either of the world wars. It's literally the most gruesome war in world history. France is not the worst nation to fight wars, not even in the last 100 years if we're honest. When they got beaten by Germany, not many other nations had the technological advancements nor strategist the germans had. Place any nation at the start of world war 2 in France's position, and they'll probably get destroyed.
It occurs to me there may be a legitimate argument that the country worst at actual *fighting* wars since 1900 is Russia/USSR.
Defeated by Japan in 1905.
Crushed in WWI to the point the empire collapsed (started off getting absolutely annihilated at Battles of Tannenburg and Masurian Lakes)
Humiliated by Poland one on one in 1920.
Absolutely mauled by germany after their alliance broke in WW2 - only stemmed the tide with a river of blood and with thanks to winter, the Allies (supplies/equipment and opening up additional fronts) and Hitler's awful strategic directives.
Fought to a standstill with atrocious losses by Finland in the Winter War.
Decades of struggling to quell insurrections and border troubles with chechens and such
Driven out of afghanistan by mujahideen