I’m just going to put this out there: Lubavitch is still staunchly anti-Zionism. The current Rebbe spoke much more openly against Zionism than the Rebbe Rayatz.
However, since major changes have occurred in the world since the early 1900s, the manner of approaching the issue has changed.
Additionally, all of this is unrelated to the obligation to ensure the absolute safety of the millions of Jews living in Eretz Yisroel–just as it is important to protect the Jewish neighborhoods of Williamsburg, Crown Heights, Flatbush, Lakewood, etc.
This includes even violating Shabbos to fight against an enemy that attempts to seize even an inch of Jewish land–since it begins with land and ends with lives (Shulchan Aruch, Orach Chaim, siman 329).