The S-400 air defence system that India wants to purchase from Russia will be a point of contention in the 2+2 talks. "They are (missile system purchase from Russia and oil from Iran) part of the conversation. They are part of the relationship. They will certainly come up, but I don't think they will be the primary focus of what it is we are trying to accomplish here," Mr Pompeo said on Tuesday to a question from reporters who are travelling with him to Pakistan and then to India.