to extract more oil and gas , but critics say is will make it harder to control climate change. ukraine s president zelensky has told the bbc that he echoes president biden s warning that any use of nuclear weapons would lead to armageddon. he s urged russians to stand up against the war. it comes as ukrainian troops continue making steady progress in reclaiming land occupied by russian forces in the east and south of the country. our world affairs editor john simpson has been speaking to president zelensky in kyiv. they begin to prepare their society. that is very dangerous. they are not ready to do it, to use it, but they begin to communicate. you mean re are begin to communicate. you mean prepare society begin to communicate. you mean prepare society for begin to communicate. you mean prepare society for using - begin to communicate. you mean prepare society for using a - begin to communicate. you mean | prepare society for using a nuclear weapon? prepare society for u