Which part of the Roman empire grew weak because of constant invasions North and South or Eastern Western?

The Western Roman Empire grew weak due to constant invasions from various groups, including Germanic tribes from the North and the Huns, who pushed these tribes into Roman territory. Economic troubles, political instability, and social issues further exacerbated its decline. In contrast, the Eastern Roman Empire, known as the Byzantine Empire, managed to survive for centuries longer, largely due to its stronger economy and fortified cities.