Barack Obama has added his support to Ukraine's international aid mission to the city of Luhansk with the Red Cross.
The mission also includes the participation from European Union, Russia, Germany and other countries. The US President expressed his support in a phone call with Ukrainian President Petro Poroshenko, the Ukrainian presidential press service said.
The White House said that Obama told Ukrainian Poroshenko that any Russian intervention in Ukraine without Kiev's consent would be unacceptable" and a violation of international law.
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Marjorie and Michael Cawdery, both 83, are understood to have been stabbed to death in a killing their family called "incomprehensible".
Detectives have launched a murder investigation following the shooting in Brent, north west London on Friday night.
Hot and humid throughout the Bank Holiday Weekend.