Russia-Ukraine War Supported by It would be the third such attack. The claim comes two days after one of Ukraine’s most ambitious operations of the war, deep inside Russia. By Marc SantoraMaria Varenikova and Sanjana Varghese Reporting from Kyiv, Ukraine Ukraine said on Tuesday that it had struck the Crimean bridge for the third time since the start of Russia’s full-scale invasion, after spending months planting explosives on support structure beneath the water. The extent of the damage was not immediately clear, but the Security Service of Ukraine, the intelligence agency known as the S.B.U, released a statement and a video that it said showed one of the detonations. “Today, at 4:44 a.m., without any civilian casualties, the first explosive device was detonated,” the agency said in a statement. “The underwater support pillars were severely damaged at the seabed level — aided by the equivalent of 1,100 kg of TNT.” Surveillance footage released by the agency and verified by The New York Times shows an explosion under the Kerch Strait Bridge, which connects Russia’s mainland and the Crimean peninsula. The attack appeared to target support features of the bridge. It was not immediately clear how much damage the bridge sustained. A photo from the agency shows some damage to its railing. All traffic on the bridge was suspended late afternoon, about an hour after the S.B.U. published its report, the agency managing the bridge said in a statement on Telegram, without specifying a reason. Thank you for your patience while we verify access. If you are in Reader mode please exit and log into your Times account, or subscribe for all of The Times. Thank you for your patience while we verify access. Already a subscriber? Log in. Want all of The Times? Subscribe.