At the outbreak of World War II, under the threat of a German bombing of Paris, Grand Duke Andrei and his family moved to Le Vésinet. They returned after three months. Following the German invasion of France, they fled by train to Grand Duke Boris's Villa in Biarritz. On 26 June, the Germans reached Biarritz and after three months the two couples decided to return to Paris. As their only source of income was the ballet school, they had to keep it opened during the war years in spite of difficulties and decreased attendance. Prince Vladimir Romanovsky-Krasinsky (who took a Westernized version of his mother's Polish name, Krzesińska, hyphenated with the adjective version of his father's name) was spoiled by his parents and never had an independent life. Because he had been a member of the "pro-Soviet " Union of Young Russians in the 1930s, he was regarded as Soviet sympathizer by the Nazi Party. Vladimir was arrested by the Gestapo and held in a camp for Russian emigrants in Compiègne. Grand Duke Andrei visited German Police Headquarters multiple times and asked for help from Russian émigrés to get his son released, but neither group would help him. Vladimir was finally freed after 119 days in detention. During the war years the two other surviving grand dukes died; Grand Duke Dmitri Pavlovich in 1942 and Grand Duke Boris in 1943. With the death of his brother Boris, Andrei became the last surviving Grand Duke of the Romanov dynasty who had been born in Imperial Russia.