queen elizabeth ii ancestry

Why did King George V not grant asylum during WWI to his cousin Alexandra Romanov and the Zsar?
I know that it was said Queen Victoria was fond of her granddaughter Alix ViKtoria Helena Louise Beatrice.. the later Tsarina of Russia.. she had hoped that Alix would marry Edward VII’s eldest son Albert Victor the Duke of Clarence but Alix already was in love with Nicholas Romanov and married him.. what I don’t understand.. King George was her cousin.. she was the child of Alice the second eldest daughter of Queen Victoria and Prince Albert..and still her cousin King George V refused asylum to the Romanovs during WWI.. so the family was executed in 1917.. I wonder why? I know Alexandra Romanov was not popular in Russia as Tsarina.. because of her German ancestry and her haughty ways. She was an unpopular woman altogether but why let the whole family die.. and the children. Anastasia, Tatiana, Olga, Marie and the son Alexei, they could have given their relatives asylum so why did George V the grandfather of Elizabeth II refuse to do so??
When Tsar Nicholas II of Russia, a first cousin of George through his mother, Queen Alexandra (Nicholas II’s mother was Empress Maria Feodorovna, Queen Alexandra’s sister) was overthrown in the Russian Revolution of 1917, the British Government offered asylum to the Tsar and his family but worsening conditions for the British people, and fears that revolution might come to the British Isles, led George to think that the presence of the Romanovs might seem inappropriate under the circumstances. Despite the later claims of Lord Mountbatten of Burma that David Lloyd George, the Prime Minister, was opposed to the rescue of the Romanovs, records of the King’s private secretary, Lord Stamfordham, suggest that George V opposed the rescue against the advice of Lloyd George. Advanced planning for a rescue was undertaken by MI1, a branch of the British secret service, but because of the strengthening Bolshevik position and wider difficulties with the conduct of the war, the plan was never put into operation. The Tsar and his immediate family thus remained in Russia and were murdered by Bolshevik revolutionaries in 1918. The following year, George’s aunt Maria Feodorovna (Dagmar of Denmark) and other members of the extended Russian imperial family were rescued from the Crimea by British ships.
The Royal Red Dragon Bloodlines 2009 Part 3