Sky News’ Sam Coates and Politico’s Anne McElvoy serve up their essential guide to the day in British politics.     It's EU summit day – so what will Keir Starmer agree?  It’s been described as an historic summit and will be a reset of relations since Brexit. It’s expected that the EU and the UK will sign a security and defense partnership.  But so far nothing is set in stone.    Plus, how sincere are Vladamir Putin's interest in a ceasefire?