Moscow talks on Ukraine 'substantial and constructive' - French source

PARIS (Reuters) - The leaders of France and Germany had "substantial and constructive" talks with Russian President Vladimir Putin about the Ukraine crisis on Friday, a French presidential source said.

Officials from the delegations remained in Moscow to continue the talks ahead of a four-way phone call on Sunday between Putin, Ukrainian President Petro Poroshenko, French President Francois Hollande and German Chancellor Angela Merkel, the source said.