This is the 1296th most frequent Russian word.
российском
"Российском" means "Russian" (relating to Russia as a state or its citizenship).
"Российском" here is used as an adjective to describe the forum, showing that it belongs to or is connected with Russia.
Я участвовал в российском научном форуме.
I participated in a Russian scientific forum.
"Российском" in this sentence functions as an adjective to describe the market as being related to Russia.
На российском рынке появилась новая технология.
A new technology appeared on the Russian market.
In this example, "российском" is an adjective that qualifies the university as being located in or affiliated with Russia.