By Tom Balmforth ISTANBUL (Reuters) -Russian negotiators at peace talks in Istanbul demanded Ukraine pull its troops out of all the Ukrainian regions claimed by Moscow before they would agree to a ceasefire,

Kyiv accused the Kremlin of introducing new “unacceptable demands” to withdraw Ukrainian forces from huge swaths of territory, collapsing the talks.

Some of Russia's demands include the withdrawal of Ukrainian troops from their own territory as a condition for a ceasefire, an unnamed Ukrainian source told Sky News.