about diplomacy. we need to be clear about what we are trying to achieve if we are going to use this economic leverage to get a political win here, but i don't see it happening in the nearfuture for sure. near future for sure. fascinating stuff there. the director of the geopolitics of energy project at harvard university's kennedy school. thank you so much forjoining us on the programme. so after days of being shelled, thousands of ukrainians and international students from the city of sumy — in the north east of the country — have been able to escape after a russian ceasefire was put in place. our eastern europe correspondent sarah rainsford is in poltava, where people have been arriving from sumy. it must have felt like the longest ride of their lives. 12 hours to escape a besieged city, driven the long route round to avoid the fighting. many were medical students from india, just relieved to flee sumy after days under russian fire. but anna is ukrainian.