By Felix Light LONDON (Reuters) -Ramzan Kadyrov, head of Russia’s region of Chechnya, said on Saturday that Moscow should consider using a low-yield nuclear weapon in Ukraine after a major new defeat on the battlefield. In a message on Telegram addressing Russia’s loss of its stronghold of Lyman in eastern Ukraine, Kadyrov wrote: “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”. He was speaking a day after President Vladimir Putin proclaimed the annexation of four Ukrainian r…