France had the largest army up until about 1815, then the United Kingdom took over.
russia
Russia is the largest nation in the world. It is in northern Europe and Asia
Spain
Russia.
The next largest country in your list would be France, who is indeed the leading agricultural nation in Europe.
Well the largest nation fully contained in Europe that was a former republic of the of the USSR is the Ukrainian SSR. The largest nation not fully contained in Europa is the former Russian SFSR that is now called Russia.
"North Korea has the largest standing army of any nation its size."
Hungary is home to Lake Balaton, the largest lake in Central Europe.
At the beginning of the 1930's France seemed to be the strongest nation in Europe. It had the second largest army and air force. Although the USSR surpassed France in the military sphere, it lacked a good economy to adequately support its military forces.
Germany has the largest GDP of any European nation. Luxembourg has the largest GDP per capita rate of any European nation, and any country of the world.
Geographically, it is France. Population wise, it is Germany.