I am an Italian ben Noach.
We have all seen that Israeli Prime Minister Naftali Bennett went to Moscow on Shabbat to meet Putin.
I believe that, since this trip has been functional to find a solution to the tremendous war conflict in existence, Premier Bennett (an observant Jew, from what I have read), has not violated Shabbat.
What are the parameters of Piku'ach nefesh that would be used to apply to a decision to travel in order to discuss future actions?