Obama 'confident' on coalition against Islamic State, but Ukraine deal has to be 'tested'

US President Barack Obama said today that he hoped the Ukraine ceasefire would hold but said he remains sceptical the pro-Russian rebels and Moscow would implement it.

"Obviously, we are hopeful, but based on past experience, also sceptical ... so it has to be tested," Obama said at the close of a NATO summit dominated by the Ukraine crisis and the alliance response to it.

Mr Obama was addressing a gathering of NATO leaders in Newport, south Wales, with the agenda firmly focused on the dual issues of Ukraine and the Islamic State.

In a statement from the NATO summit, Ukrainian President Petro Poroshenko said that both sides had agreed to a roadmap to a lasting ceasefire, and that it was important to continue a "political dialogue."

"Significant steps have been taken including decentralisation of power which guarantee the rights to use any languages on this territory," he said.

"This peace process is based on my peace plan and on the territorial integrity and sovereignty of my country."

Mr Obama also said he was "confident" on the creation of a broad international coalition to counter Islamic State extremists.

"I leave here confident that NATO allies and partners are prepared to join in a broad, international coalition," he said, adding that US Secretary of State John Kerry would travel to the Middle East for talks to include regional powers.