Ukraine, in January 2022, had more tanks than Germany, France, and the UK combined.
They had more air defense than Germany, France, and the UK combined, though the systems were not quite as capable individually.
They had nearly as many active duty military as Germany, France, and the UK combined, and a huge number of reservists with experience fighting in the War in Donbass against Russian military and paramilitary forces with tanks and artillery, as opposed to jihadists with no real heavy weapons of any kind.
Their airforce was mostly comparable in size to any one of the above, though again not as capable qualitatively.
And they had a hell of a lot more artillery and artillery shells than Germany, France, and the UK combined. By a massive margin, although again not quite as capable individually. Nearly all of the NATO-standard artillery ammunition that has been provided to Ukraine has come from US stockpiles, because at the rate Ukraine consumes artillery ammo Germany, France, and the UK would be collectively tapped out in about 10 days. Not to mention HIMARS ammunition.
The Russians were also rather handicapped by the reckless, arrogant stupidity of their plan and extreme secrecy resulting in soldiers selling their fuel rations for alcohol, because until a day or two beforehand they thought was all a bunch of western lies because that's what the government was saying publicly. With the result that a bunch of vehicles ran out of fuel halfway to Kyiv. Had the invasion been done according to doctrine rather than as what they expected to be an immediate victory as the Ukrainians laid down their arms, awed by their superior military power, the story may still have turned out very different.
Anyway, Ukraine had, by a very significant margin, the largest military in Europe excluding Russia, and certainly the most experienced in fighting "real" wars. Take this into consideration when boasting about how easily the rest of Europe would be able to handle a Russian invasion.