The capture came just a day after Putin proclaimed the annexation of four Ukrainian regions - including Donetsk, where Lyman is located - and placed them under Russia's nuclear umbrella, at a ceremony that was condemned by Kyiv and the West as an illegitimate farce.The Ukrainian soldiers made the claim in a video that was recorded outside the town council building in the centre of Lyman and posted on social media by Kyrylo Tymoshenko, deputy head of President Volodymyr Zelenskiy's office."In my personal opinion, more drastic measures should be taken, right up to the declaration of martial law in the border areas and the use of low-yield nuclear weapons," Kadyrov wrote on Telegram before Zelenskiy spoke.Other top officials, including former president Dmitry Medvedev, have suggested Russia may need to resort to nuclear weapons, but Kadyrov's call was the most urgent and explicit.Putin said last week that he was not bluffing when he said he was prepared to defend Russia's "territorial integrity" with all available means, and on Friday made clear this extended to the new regions claimed by Moscow."