LONDON — Yulia Skripal, whose poisoning with a nerve agent in Britain this year set off a diplomatic clash between Moscow and the West, on Wednesday gave her first videotaped statement since the attack, describing her recovery as “slow and extremely painful” and saying that she hoped someday to return to Russia.

Ms. Skripal spoke to Reuters from an undisclosed location in London, and apart from a scar on her neck, apparently from a tracheotomy, appeared to have no visible aftereffects from the nerve agent, one of a strain of lethal poisons developed during the last years of the Soviet Union. She was shown walking along a leafy path, wearing a flowery dress, her hair newly styled.

Ms. Skripal’s appearance seemed intended to quell speculation, promulgated by the Russian government, that Britain had fabricated the March 4 poisoning of Ms. Skripal and her father, Sergei V. Skripal, or was keeping them prisoner. Viktoria Skripal, a cousin living in Russia who has openly questioned British reports, has twice been denied visas to the United Kingdom.

Britain has blamed Moscow for the attack, an accusation that the Kremlin has denied, and the dispute precipitated a series of expulsions of diplomats between the two countries and beyond.