Vacationing in Florida, President Barack Obama continued his telephone consultations with world leaders on Ukraine, speaking one on one Saturday with the leaders of three European powers and collectively with the heads of the three Baltic states, White House said. Obama held individual conversations with British Prime Minister David Cameron, Italian Prime Minister Matteo Renzi and French President Francois Hollande. He also held a conference call with Latvian President Andris Berzins, Lithuanian President Dalia Grybauskaite and Estonian President Toomas Hendrik Ilves. On the conference call, Obama reaffirmed the United States' "unwavering commitment" to its collective defense commitments under NATO and...