Putin has apparently upped the ante, charging that the USA either leaked information about the downed Russian jet, or that their allies did, causing the plane to be targeted.
The leadership of the USA has been too eager, for years, to engage in treaties and mutual protection agreements with other countries. We're currently committed to send troops into too many international fights.
I'm not gonna go all Rand/Ron Paul on you, but it does seem prudent to re-examine the extent of our alliances, and let those other countries know that we expect them to limit their belligerence, territory acquisitions, and watch who they let into their borders - at least, if they want our help.
If they don't need us, hey, knock yourself out, do whatever you want.
Keep in mind that this could easily be disinformation, what we in the States would call blatant lying to achieve our aims. Russia is notorious for that practice, and Putin probably learned something from his years working for the KGB.