Russia launched the Cosmos 2546 satellite into a highly elliptical Earth orbit at 0731 GMT using a Soyuz 2-1B/Fregat M launch vehicle from Pad 43/4 at the Plesetsk Cosmodrome in Northern Russia. Cosmos 2546 is also known as Tundra 4, Kupol No. 4 and EKS 4. The satellite will be placed into the EKS constellation to provide Missile Early Warning to the Russian Ministry of Defence.
Update on 23 May 2020: Cosmos 2546 confirmed as successfully launched into Molniya style 38,508 x 1656 km orbit at 63.8 degrees inclination.