Russia and Ukraine have agreed to a naval ceasefire in the Black Sea in separate deals with the US, after three days of peace talks in Saudi Arabia, BBC reported.

Washington said all parties would continue working toward a "durable and lasting peace" in statements announcing the agreements, which would reopen an important trade route.

They have also committed to "develop measures" to implement a previously agreed ban on attacking each other's energy infrastructure, the White House said.

But Russia said the naval ceasefire would only come into force after a number of sanctions against its food and fertiliser trade were lifted, according to BBC.