> In all honesty, would you hold that argument if Mexico decides to host Russian or Chinese troops?

Ukraine wasn't hosting foreign troops (except Russian troops, some of whom were were the spearhead of the invasion) when the Russo-Ukrainian war started with the Russian invasion in 2014.

(They did start hosting some that were involved in training and advisory assignments after the war started and before the major escalation in 2022, but those can hardly justify the war which started with the 2014 invasion.)