According to Wikipedia: "The PAK DA (or PAK-DA), is a Russian next-generation strategic bomber design, developed by the Tupolev Design Bureau. The PAK DA acronym stands for perspektivnyi aviatsionnyi kompleks dal'ney aviatsii literally meaning "prospective aviation complex for long-range aviation". The PAK DA was planned to be a new stealthy strategic bomber and is expected to enter service in 2025–30, with the first aircraft previously planned for delivery in 2020, but delivery will now occur in 2023."