The Russian drone breach of Chornobyl's New Safe Confinement allowed moist air to enter the structure, creating corrosion risks for its protective steel arch.

From the articleG7 countries pledge 260 million euros to repair Chornobyl safety infrastructure damaged in Russian attackAlso in UK Pledges $23M for Chornobyl Repairs Amid Support Strains, Ukraine war briefing: UK pledges £17m to repair Chornobyl attack damage amid fears of slipping US support