Glushko couldn't obtain the required thrust from the R-3 engines, so the project was canceled in 1952; and Korolev joined the Soviet Communist Party that year to request money from the government for future projects including the R-5, with a more modest range. It completed a first successful flight by 1953. The world's first true intercontinental ballistic missile (ICBM) was the R-7 Semyorka. This was a two-stage rocket with a maximum payload of 5.4 tons, sufficient to carry the Soviets' bulky nuclear bomb an impressive distance of . After several test failures, the R-7 successfully launched on 21 August 1957, sending a dummy payload to the Kamchatka Peninsula. Because of Korolev's success with the R-7 and because the Soviet Union had successfully created the ICBM before the United States of America, he was nationally recognized by the Soviet Union, although his name was kept secret. However, despite the Soviet R-7 initial success, it experienced later failures as it was not intended to be a practical weapon. On 19 April 1957 Korolev was declared fully "rehabilitated", as the government acknowledged that his sentence was unjust.