Obama on Ukraine ceasefire: 'It is too early to tell'

President Obama has said it is "too early to tell" what the Ukraine ceasefire means.

Ukraine's President Petro Poroshenko says he has agreed with Russian President Putin by phone on a "ceasefire process" for the east.

The Kremlin stressed Mr Putin had not agreed to a ceasefire as Russia was not party to the conflict.

Mr Obama said "we have not seen a lot of follow-up on so-called announced ceasefires".