Polish Prime Minister Mateusz Morawiecki and Ukrainian Prime Minister Denys Shmygal attend a news briefing following their talks in Kyiv, Ukraine February 1, 2022. REUTERS/Valentyn Ogirenko Read More KYIV, Feb 1 (Reuters) - Britain, Poland and Ukraine are working to strengthen their three-way cooperation in the face of the threat of a new Russian military intervention, the leaders of the two easte