TODAY: Rebels admit owning Buk missile system; still lay the blame on Ukraine; two fighter jets shot down in eastern Ukraine; Russia asserts sanction impact negligeable; EU mulls measures against Russia, rifts likely to thwart sanctions drive. Concerns over climate for media workers in Ukraine; NGO foreign agent law claims new victims.  In an interview with Reuters, Ukrainian rebel leader Alexander Khodakovsky has acknowledged that separatists have in their possession the Buk anti-aircraft system suspected to have shot down MH17, but blamed Kiev for the incident on the basis that it knew that the missile was in separatist-held territory and ‘did nothing to protect security, but provoked the use of this type of weapon against a plane that was flying with peaceful civilians.’  Two Ukrainian Sukhoi fighter jets have reportedly been shot down in eastern Ukraine by pro-Russia rebels, just 16 miles from the MH17 crash site.  The White House sees this latest move as evidence of a systematic campaign by separatists using Russian weapons against aircraft.  Ukraine’s Security Council believes the military jets were hit by missiles launched from Russia itself.  The volume of weapons Russia is channelling to Ukraine’s East suggests it is ‘trying to create a proper military force‘, says an analyst in the FT.  A group of U.S. senators have proposed designating the self-declared Donetsk People’s Republic a ‘foreign terrorist organization‘.  Alexander Borodai, the head of the aforementioned Republic has said that bodies of victims of the MH17 disaster were not kept in refrigerated conditions because the OSCE representatives failed to arrive at the crash site promptly.  The blackboxes from the flight have reached the International Civil Aviation Organization in good condition.