Documents provided by Ukrainian, Russian, and European sources, confirmed by negotiators and officials, reveal disagreements over arms levels, Ukraine’s potential EU membership, and Ukrainian language and culture laws that Russia wanted repealed. While Ukraine agreed to forgo NATO membership and accept Russian occupation of some territory, it refused to recognize Russian sovereignty over it. Russia demanded Ukraine make Russian an official language. Read also: Russian advance in Donetsk Oblast: Gains near Sokil and Novooleksandrivka Despite Ukraine’s fierce resistance, Russia appeared open to …