David Lammy slams Vladimir Putin for not attending Ukraine peace talks in Istanbul / Foreign Office denies David Lammy and wife dodged taxi fare from Italy to France / David Lammy denies misleading MPs on Israel arms exports after bombshell report / David Lammy's team speaks out over claim he 'refused to pay PS590 taxi fare' / David Lammy to host leaders for critical talks about Russia's 'existential' threat to Europe / David Lammy 'must explain if he misled us on Israel arms exports', MPs say / UK and France in talks over Palestine recognition, David Lammy confirms / Israel accelerating illegal West Bank expansion 'eight times faster' - David Lammy / MPs urge David Lammy to intervene as British man remains in jail in India / David Lammy humiliated as US top brass pull out of his London Ukraine peace talks