This is the 10682nd most frequent Russian word.
вооружением
"Вооружением" translates to "armament" or "weaponry" in English.
The term 'вооружением' is used in its instrumental case form, indicating the tools or means by which something (in this case, the armies) are equipped.
Современные армии оснащены продвинутым вооружением.
Modern armies are equipped with advanced weaponry.
Here, 'вооружения' appears in its genitive case form, denoting possession or association with something (new weaponry).
Разработка нового вооружения требует значительных инвестиций.
The development of new armament requires significant investments.
In this sentence, 'вооружения' serves as a noun in the nominative case within a prepositional context, specifying the kind of project.