The US, UK and friends didn't annex Kosovo, Iraq, Afghanistan, Sierra Leone, Libya, Bosnia etc.
They also didn't create the problems there in the first place, in order to give them an excuse to invade. There were already huge problems. In the case of Bosnia, Kosovo and Sierra Leone they weren't even acting out of raw national interest, they were intervening on humanitarian grounds. Were all motives pure and lilly-white? I doubt it. This is diplomacy and international politics we're talking about.
But any comparison to Russia's nakedly aggressive and foolish actions in Ukraine is utterly ridiculous.
Even in the case of Iraq, which was the most fucked-up and least easy to justify of the recent conflicts we've got involved in, something had to be done. Iraq was a proven aggressive state, in a very sensitive area, with lots of lovely oil. Plus chemical weapons and a desire to use them. And a desire to massacre his own population. Which we'd decided not to ignore, and so we had promised protection to the Kurds and Marsh Arabs (after letting lots of them get killed first). Sanctions were breaking down, in large part due to Russia (and France), but also the neighboring countries not wanting to enforce them. Whether Sadam had much in the way of working, deployable, chemical weapons was unknown, but no-one seriously doubted that there were still some stockpiles left, and most of the scientists were still around to rebuild the program extremely quickly.
The US and friends didn't then simply invade. They spent a year saying what they'd do. Agreed to send in relatively neutral inspectors, so Sadam could cooperate if he wanted to avoid war. He didn't. So he didn't. Then they fucked up the rebuilding. But they didn't level the place and then just bugger off. They attempted to rebuild, get the oil industry going to fund the economy and set up a working government. In the middle of the civil war that was probably inevitable in Iraq after Sadam fell. The minority from the Sunni centre of the country still wanted to run the place - and everyone else had good reason to hate them for it.
What didn't happen was a sneaky overnight invasion, with no attempt at negotiation - with no legitimate reason to do so. If you can't see the difference in that, and the danger in that, I suggest you read some history of international relations.