Original sentence: The Sloviansk Standoff has been an ongoing altercation between Ukrainian security and military forces and occupying pro-Russian rebels held up parts of the city of Sloviansk, in Donetsk Oblast, a part of Ukraine
Edited sentence: The Sloviansk Standoff has been an ongoing altercation between Ukrainian security and military forces and occupying pro-Russian militants held up parts of the city of Sloviansk, in Donetsk Oblast, a part of Ukraine