Ukraine conflict: UK joins Nato exercise in Poland UK troops have taken part in the largest British armoured exercise in Europe since 2008. More than 300 vehicles and 1,350 British troops took part in the bi-lateral training exercise with Poland. The Nato exercise comes as US Vice-President Joe Biden, visiting Ukrainian President Petro Poroshenko, warned Russia that it faces further isolation if it continues to violate ceasefires with Ukraine. Defence correspondent Jonathan Beale reports from northern Poland.