The New Safe Confinement at Chornobyl is a €2.1 billion ($2.5 billion), 35-story arch structure built in 2016 over reactor No. 4 to contain radioactive material and enclose the original sarcophagus.

From the articleUK Pledges $23M for Chornobyl Repairs Amid Support StrainsAlso in G7 countries pledge 260 million euros to repair Chornobyl safety infrastructure damaged in Russian attack