Sept 1 (Reuters) - Ukraine's President Volodymyr Zelenskiy warned airlines and insurance companies on Tuesday that the presence of Ukrainian drones had made Russian skies dangerous to use and were effectively closed. President Volodymyr Zelenskyy warned that Ukrainian drones will continue operating over Russia. Key points and original sources are listed below.

• Sept 1 (Reuters) - Ukraine's President Volodymyr Zelenskiy warned airlines and insurance companies on Tuesday that the presence of Ukrainian drones had made Russian skies dangerous to use and were effectively closed.S1

• President Volodymyr Zelenskyy warned that Ukrainian drones will continue operating over Russia.S2