This is the 8758th most frequent Polish word.
rosatom
"Rosatom" is not a Polish word; it refers to the Russian state nuclear energy corporation specializing in nuclear power and technology.
In this sentence, 'Rosatom' is used as the subject, referring to the Russian state corporation specializing in nuclear energy.
Rosatom jest firmą, która buduje elektrownie jądrowe.
Rosatom is a company that builds nuclear power plants.
Here, 'Rosatomu' (genitive form) refers to the organization whose operations might be impacted.
Amerykańskie sankcje mogłyby znacząco wpłynąć na działalność Rosatomu.
American sanctions could significantly affect Rosatom's operations.
In this context, 'Rosatomu' (possessive/genitive form) indicates ownership, referencing the technologies developed under Rosatom.