In this photo taken on Tuesday Nov. 18, 2014  provided by the office of the chief forestry in Szprotawa (Nadlesnictwo Szprotawa), firefighters battle the blaze on a 750-year-old oak tree near Szprotawa, Poland. A suspected arson fire damaged the tree believed to be the country's oldest. The deputy chief forest ranger in Szprotawa, Jerzy Wilanowski, said Monday Nov. 24, 2014 that firefighters battled the blaze for more than 30 hours last week using water and foam.   (AP Photo/Nadlesnictwo Szprotawa)

“I was sure that the “grandpa” would survive me, but now I’m not so sure,” Wilanowski told The Associated Press, referring to the tree in an affectionate way. “We have to wait.”

U.S. Vice President Joe Biden  smiles as he arrive to meet with Ukrainian President Petro Poroshenko during a visit in Kiev, Ukraine, Friday, Nov. 21, 2014. Biden is also visiting Turkey  and is the latest in a stream of U.S. officials who have traveled to Turkey to urge Ankara to step up its role in fighting Islamic State militants in neighboring Syria.  (AP Photo/Efrem Lukatsky)

“If Russia were to fulfill these commitments and respect Ukrainian sovereignty and territorial integrity, we could begin a rational discussion about sanctions,” Biden said.