This is the 9052nd most frequent Russian word.
российскими
"Российскими" means "Russian" (adjective, referring to something related to Russia as a country).
Adjective modifying 'учёными' to specify nationality.
Я горжусь российскими учёными.
I am proud of Russian scientists.
Adjective modifying 'дорогами' to describe their location in Russia.
Российскими дорогами управляют различные фирмы.
Russian roads are managed by various companies.
Adjective modifying 'технологиями' to indicate they originate in Russia.