What is the difference between Putin/Ukraine and Bush/Iraq?

This question has yet to be answered in a satisfactory manner. Actually, the media has done their best to play it down and not answer it at all.

Putin invaded Ukraine to protect his country's borders from an encroaching NATO. He used killing Nazis as an excuse but that was just a cover. War is ongoing but several thousand have died so far.

Bush invaded Iraq cause of oil and his Daddy issues. He used Weapons of Mass Destructions and AL Qaeda as excuses. After an exhaustive search, no WMDs were ever found. Also, it was determined that there was never any link between Saddam and Bin Laden. The Iraq war cost hundreds of thousands of lives. Some estimates have the death toll over a million when factoring the insurgency and other violence.

Bush never faced justice for this war crime. He was heavily criticized domestically until the 2008 election. After Obama won, the media started portraying Bush as misunderstood. Today he is looked at as a kindly grandfather figure who opposed the evil Trump.

Meanwhile, Putin is being portrayed as the new Hitler by the world media. Even though the scale of death and destruction in Ukraine does not even approach what the kindly grandfather did in Iraq. Even if the war rages on for years I do not see it approaching Iraq levels of casualties.

So, why does Bush get a pass while Putin is crucified?

Which country had a better rationale for invading another sovereign nation?