borisjohnson says there s a realistic possibility the war in ukraine could continue until the end of next year. but, speaking on a visit to india, he insisted vladimir putin would not succeed in trying to grind the ukrainians down. miles of defensive trenches have been dug around the capital, kyiv, as a precaution should russian troops return, with life now less precarious after the city was successfully defended few weeks ago. our correspondent mark lowen has been spending time with ukrainian troops in the capital. gunfire for the defenders of kyiv, the battle isn t over. this time, its training, but while the enemy has retreated to the east, the danger still looms. vlad was a phd law student until the russians tried and failed to seize his city. do you think it is possible that they could come back?