here. but how can it inflict the significance or similar economic pain on the united states, for example one of the companies affected here is one of russia's principal arms exporters. they have said that the sanctions really just show that the united states is trying to gain unfair advantage essentially in the global sales of weapons. so, you know, how will they come back against that particular issue. it is very clear that they will come back fighting, but as i say, asymmetric is the most likely way forward. >> all right. nic robertson live for us in moscow. thank you so much. we'll stay in touch with you. there is talk of a trade war between the united states and china. it heated up on frir a friday a.