A number of options for ceasefire are on the table.
Teams from Ukraine and Russia are in Istanbul ahead of a fresh round of peace talks.
A number of options for a ceasefire are on the table, including for Ukraine to remain neutral.
Meanwhile it's claimed two Ukrainian negotiators and Russian oligarch Roman Abramovich were poisoned earlier this month.
The US has suggested symptoms suffered by the men were caused by environmental issues instead.
Ukraine's foreign minister Dymytro Kuleba had this advice for teams in Turkey.
Turkish President Recep Tayyip Erdogan welcomed the teams, telling them the world is waiting for good news.
