According to Litchi News, Putin can write a letter in Moscow, Russia, without a specific address and the exact name of the recipient.

VladimirVladimirovichPutin (English), 1952,1kloc-0/0 was born in Leningrad (now St. Petersburg) on October 7, and is the president of Russia. He served as Russian Prime Minister, Chairman of United Russia Party and Chairman of the Council of Ministers of Russia-Belarus Union. Honorary Doctor of Tsinghua University.