This isn't enough to win. Ukrainian Ground Forces were 200k at the beginning of this war, for comparison. And Ukraine have been conducting mobilization since the war started, so it's larger by a lot now and will grow with each day of war.
If only I was discussing that, right?
> And Ukraine have been conducting mobilization since the war started
Yes, but the original question was, "Why is Europe increasing defense spending". The sum total of Europe's deployed forces is smaller than Ukraine's was before this war.