encouraging Russia to "do whatever the hell it wants to a NATO ally"...i.e. the U.S. can no longer be counted on, so NATO needs to fend for itself against the reason they exist as an alliance...Putin...who just happens to have a hold on Trump...and they know it. Trump sees it as "Deal Making"...NATO sees it as "Alliance Breaking".
btw, this is very likely to result in decreased U.S. Defense Industry sales...as well as influence.