NATALIA ZINETS and MARGARYTA CHORNOKONDRATENKO A Belarusian activist living in exile in Ukraine was found hanged in a park near his home in Kyiv early on Tuesday, and Ukrainian police launched a murder investigation. Vitaly Shishov, who led a Kyiv-based organisation that helps Belarusians fleeing persecution, had been reported missing by his partner on Monday after failing to return home from a run. Police said they were considering the possibility of suicide or of a murder staged to appear as a suicide. Shishov had been found with abrasions on his nose and knee but it was too early to determine…