Russian ⇄ English

подготовка по иностранному языку stresses
mil.	foreign language proficiency; language qualification; language readiness
подготовка по иностранным языкам
intell.	training in foreign languages (the ~; Defense Language Institute Alex_Odeychuk)
mil.	language training

подготовка по иностранному языку: 13 phrases in 3 subjects

Education	6
Intelligence and security services	3
Military	4