Some context: Joseph Conrad (Polish pronunciation: ['juzef ,kon.rad]; born Jozef Teodor Konrad Korzeniowski; 3 December 1857 - 3 August 1924) was a Polish-British writer regarded as one of the greatest novelists to write in the English language. He joined the British merchant marine in 1878, and was granted British citizenship in 1886. Though he did not speak English fluently until his twenties, he was a master prose stylist who brought a non-English sensibility into English literature. He wrote stories and novels, many with a nautical setting, that depict trials of the human spirit in the midst of an impassive, inscrutable universe.
Conrad was a Russian subject, having been born in the Russian part of what had once been the Polish-Lithuanian Commonwealth. In December 1867, with the Russian government's permission, his father Apollo had taken him to the Austrian part of the former Commonwealth, which enjoyed considerable internal freedom and a degree of self-government. After the father's death, Conrad's uncle Bobrowski had attempted to secure Austrian citizenship for him - to no avail, probably because Conrad had not received permission from Russian authorities to remain abroad permanently and had not been released from being a Russian subject. Conrad could not return to Ukraine, in the Russian Empire - he would have been liable to many years' military service and, as the son of political exiles, to harassment.  In a letter of 9 August 1877, Conrad's uncle Bobrowski broached two important subjects: the desirability of Conrad's naturalisation abroad (tantamount to release from being a Russian subject) and Conrad's plans to join the British merchant marine. "[D]o you speak English?... I never wished you to become naturalized in France, mainly because of the compulsory military service... I thought, however, of your getting naturalized in Switzerland..." In his next letter, Bobrowski supported Conrad's idea of seeking citizenship of the United States or of "one of the more important Southern Republics".  Eventually Conrad would make his home in England. On 2 July 1886 he applied for British nationality, which was granted on 19 August 1886. Yet, in spite of having become a subject of Queen Victoria, Conrad had not ceased to be a subject of Tsar Alexander III. To achieve the latter, he had to make many visits to the Russian Embassy in London and politely reiterate his request. He would later recall the Embassy's home at Belgrave Square in his novel The Secret Agent. Finally, on 2 April 1889, the Russian Ministry of Home Affairs released "the son of a Polish man of letters, captain of the British merchant marine" from the status of Russian subject.
Why would they not give him permission?
A: and had not been released from being a Russian subject.

Some context: Serebro (Russian: Serebro; English translation: Silver) (Stylized as SEREBRO) is a Russian girl group formed by their manager and producer Maxim Fadeev.
Polina Favorskaya (Russian: Polina Favorskaia, born 21 November 1991 in Volgograd, Russia) was the replacement of Elena Temnikova, who was introduced 5 June 2014. Favorskaya announced she was leaving the group in August 2017, but continued performing with them until the end of 2017.  Anastasia Karpova (Russian: Anastasiia Karpova, born 2 November 1984 in Balakovo, Russia) was very interested in music since her early age, but dedicated herself to ballet. She was also attending singing classes and decided to pursue her singing career. Anastasia had replaced Lizorkina, after the latter announced her departure. She first had her debut with the group on their single "Like Mary Warner". Anastasia, along with Elena and Olga had recorded their second studio album Mama Lover, making it Karpova's first full-length studio album. Karpova decided to leave the group to pursue a solo career. The song "UGAR" was her last song with the group.  Marina Lizorkina (Russian: Marina Lizorkina, born 9 June 1983 in Moscow, Russia) entered the Contemporary Art University in Moscow at the age of sixteen. She used to sing in a choir, before she became the lead singer of the group "Formula". In 2004, they released a few singles for the series Obrechennaya Stat Zvezdoy. Lizorkina was the last to join Serebro, after she saw an Internet announcement.  Dasha Shashina (Russian: Dasha Shashina, born 1 September 1990 in Nizhny Novgorod, Russia) is the replacement of Anastasia Karpova, who began performing with the group in October 2013. Shashina left the group in March 2016 due to serious health issues and having to undergo two surgeries.  Elena Temnikova (Russian: Elena Temnikova, born 18 April 1985 in Kurgan, Russia) came to media prominence as a contestant on the Channel One talent show Star Factory in 2003. She was spotted by Maxim Fadeev, the main producer of Star Factory, and signed to his recording company Monolit Records. Although Temnikova released two disco singles, "Begi" and "Taina", she did not continue her solo career and joined Serebro instead. She married co-member of Star Factory Alexey Semenov; the two separated in 2007, before a settlement for divorce. She then had a brief conflict with Fedeev, after dating and subsequently leaving his brother. She currently resides in Moscow, Russia. On 15 May 2014 the official Serebro website reported that Elena had left the group due to ill health. She was replaced with Karpova who had left the band earlier the previous year until they find a replacement.
Who have been members of the group Serebro?
A:
Polina Favorskaya (Russian: Polina Favorskaia, born 21 November 1991 in Volgograd, Russia) was the replacement of Elena Temnikova,