Key developments on Sept. 1:
* Ukraine liberates village of Novoekonomichne in Donetsk Oblast, General Staff says
* Russian front-line advances have slowed down in August, monitoring group says
* Russian forces allegedly preparing major assault toward Siversk in Donetsk Oblast, Ukraine's military says
* Ukraine says it destroyed 2 Russian Mi-8 helicopters, hit tugboat in occupied Crimea, shares footage
* Zelensky announces faster air defense deliveries after deadly Russian strikes
Ukraine