In my opinions, the more interesting question is why is the response in this war so fast and comprehensive... and my guess would be that it has the unified political willpower of most western nations behind it. Poland, Germany, France have no interest of seeing Putin succeed at a military show of force less and a days train ride from their borders.

When it comes to the middle east and further away places (geographically and culturally) the political willpower is often more oriented toward alliance contracts with other nations and idealogical reasoning... not perceived existential threat.

[edit] changed wording (socially -> culturally)