The term backyard implies a proprietary relationship, Ukraine isn't part of Russia's backyard and hasn't been for a long time now, and in the minds of the Ukrainians has never been part of Russia's backyard. The fact that the OP believes this to be so belies even the most basic insight into the reality for millions of people in former USSR countries who have in living memory what it means to be part of Russia's backyard and what the price to them would be if those days were to return.
Calling Siberia or Kamchatka Russia's backyard might be accurate. But just like Canada isn't America's backyard neither is Ukraine - or any other former USSR vassal state - Russia's backyard.
Neighbors is an entirely different term.
As for Europe-Russian disputes, there is such a thing as NATO, which was good enough to be relied on after 9/11, I take it that it is still in force? If not can you point me to the news that I apparently missed?
Words mean different things to different people. Personally I have never heard "backyard" as in "in my backyard" used that way. A slang dictionary yields this:
>An area nearby to a country or other jurisidiction's legal boundaries, particularly an area in which the country feels it has an interest. https://www.yourdictionary.com/backyard
Which seems spot on, I swear I didn't just write that myself. The WSJ even went so far as to call Equatorial Guinea (in West Africa) part of America's backyard: https://archive.fo/8UjYC
"In my own backyard" would connote what you are saying, but there's an extra word "own" there.
That's fine, but the implied sentiment was that if there is trouble in Europe's 'backyard' that we're on our own, loud and clear. Isolationism worked so well against mad dictators the last time we tried it, I'm sure this time around it will all be peachy.
Calling Siberia or Kamchatka Russia's backyard might be accurate. But just like Canada isn't America's backyard neither is Ukraine - or any other former USSR vassal state - Russia's backyard.
Neighbors is an entirely different term.
As for Europe-Russian disputes, there is such a thing as NATO, which was good enough to be relied on after 9/11, I take it that it is still in force? If not can you point me to the news that I apparently missed?