The former Russian president was reacting to the imminent signing of a security agreement between London and Kiev
Moscow would consider the open deployment of British troops to Ukraine as a “declaration of war,” former Russian President Dmitry Medvedev has warned. He was responding to a visit to Kiev on Friday by UK Prime Minister Rishi Sunak, who is set to sign a security agreement with Ukrainian President Vladimir Zelensky.

Sunak’s arrival in the Ukrainian capital is meant to “set out a major new package of support and reaffirm the close UK-Ukraine partnership,” his office said in a statement. The security document is a follow-up to agreements reached by G7 and NATO members last year, it noted. The statement did not mention any plans for a British military deployment in Ukraine.....more here

https://www.rt.com/russia/590534-medvedev-uk-ukraine-security/