As Qatar’s ambitions to become a regional player grew, it repeatedly offered to broker peace between Israel and the Arab states, and also tried to negotiate between conflicting parties. But Sunni Gulf States are irritated by this mediation and suppose that Doha tries to undermine stability of Arab countries. This is the reason for the tension in Doha's relations with Riyadh and Abu Dhabi. As a result, Saudi Arabia, the UAE, Bahrain and Egypt declared a blockade on Qatar in June 2017. They accused Qatar of supporting terrorism, demanded to break off all ties with Iran and to close the Turkish military base on its own territory. Qatar tries to ease tensions with the Gulf States by using American lobbyists, Israeli interests, and the Jewish-American community. Qatar follows defensive realism in the combination with the “buck passing” strategy – transferring the responsibility to act to other States while remaining on the sidelines. This is transferring the responsibility to act to the U.S. Qatar's relations with Israel and the Jewish-American community should shift the U.S. position in favor of Qatar. The main conclusions are the following: 1) there is little chance of luck lobbying in the U.S. for any interests of any State that cooperates with Iran. But the development of Qatari-Israeli relations makes it difficult to accuse Qatar of supporting Iran; 2) the development of Qatari – Saudi crisis shows that attempt both rival parties to “buck-pass” by one superpower is inefficient. The reason is that both Qatar and Saudi coalition act like US's clients.