关税，突发大利好

Group 1: US-EU Tariff Negotiations - The deadline for US-EU tariff negotiations has been extended to July 9, as requested by the EU, and President Trump has agreed to this request [2] - Trump suggested imposing a 50% tariff on EU goods starting June 1, claiming that the EU was established to take advantage of the US in trade [2] Group 2: Harvard University Funding and International Students - President Trump threatened to stop federal funding to Harvard University and demanded the names and nationalities of all international students for further review [3] - The US government announced the cancellation of Harvard's eligibility for the Student and Exchange Visitor Program, prohibiting the university from enrolling international students [3] Group 3: US-Iran Relations - President Trump stated that there has been substantial progress in discussions with Iran regarding its nuclear program, following five rounds of indirect negotiations [4] - The next round of negotiations between the US and Iran has not yet been scheduled [4] Group 4: Security Developments in Russia - The Russian military confirmed it is establishing a security zone along the border with Ukraine, following recent territorial gains in the Sumy region [6][7] - President Putin announced the creation of a security buffer zone in the border areas to protect Russian regions from potential attacks by Ukrainian armed forces [8]