article_snippet: Kovtun and Lugovoi deny involvement and remain in Russia.
article_snippet: It was unclear whether Russian Russian was offering to give evidence by video link or face questioning by police.
highlights_snippet: Met former Russian agents Andrei Lugovoi and Dmitri Kovtun three weeks earlier .
  
highlights_snippet: Met former Russian agents Andrei Lugovoi and Dmitri Kovtun three weeks earlier .
   