Where does “sotilasvakoilu” come from?

sotilasvakoilu (Finnish) comes from Finnish sotilas, from Finnish -las, from Finnish -lä, from Finnish -as, from Proto-Finnic -s, from Proto-Finno-Ugric -s.

sotilasvakoilu (Finnish): military espionage

Definitions

military espionage

Ancestry of “sotilasvakoilu”, step by step

sotilasvakoilu traces back through two separate lines of ancestry.

via Finnish sotilas

Step	Language	Word	Meaning
1	Finnish	sotilas	soldier; pawn; jack, knave
2	Finnish	-las	Forms nouns used to describe people; Forms...
3	Finnish	-lä	Front vowel variant of -la
4	Finnish	-as	Forms some adjectives; Forms some nouns
5	Proto-Finnic	-s	Forms nouns
6	Proto-Finno-Ugric	-s	—

via Finnish vakoilu

Step	Language	Word	Meaning
1	Finnish	vakoilu	espionage, spying
2	Finnish	-u	Forms nouns from verbs. Most common with "e"- and...
3	Proto-Finnic	-u	Forms nouns from adjectives, nouns

Every word from Proto-Finno-Ugric -s →Every word from Finnish -lä →Every word from Finnish -las →