A White House official said US President Barack Obama and Russian President Vladimir Putin will speak by phone Friday and focus on the crisis in Ukraine."Obviously they will talk about Ukraine", White House press secretary Jay Carney said. "It is in Russia's interest for the violence in Ukraine to end, as it is in the United States' interest."The phone call between the two leaders comes after an agreement between Ukrainian President Viktor Yanukovych and protesters to try to resolve the crisis.The Obama administration has grown frustrated with Putin over a host of foreign policy issues, including Syria, Egypt and Iran.