Russia had no issue deploying such weaponry on NATO's doorstep (Kaliningrad teaming with weaponry, including short-range ballistic missiles that Russia claimed

Russia had no issue deploying such weaponry on NATO's doorstep (Kaliningrad teaming with weaponry, including short-range ballistic missiles that Russia claimed to no longer hold, long-range AA missiles, constantly flying bombers into NATO airspace, etc.). So for the analogy of Canada-China alliance, you'd need, hmm, East China Sea to be already teaming with US or NATO weaponry. Not just an aircraft carrier here and there, but sizeable army ready to attack. (clearly doesn't work so very well with a maritime border, but that's where China's fragile bits are. US troops in Kyrgyzstan clearly stir far less emotions. Indeed Americans were in Afghanistan which borders China and they didn't seem to mind).