Ukraine PM slams Putin, ceasefire again under strain in east Ukraine
* Yatseniuk says Putin wants "frozen conflict" in Ukraine
* Says wants Ukraine in NATO, though knows this not on cards now
* Renewed shelling at Donetsk airport undermines ceasefire
* Ukraine's economy may shrink by up to 10 pct in 2014 - cbanker
By Gareth Jones and Anton Zverev
KIEV/DONETSK, Ukraine, Sept 13 (Reuters) - Ukraine's prime minister accused Russian President Vladimir Putin on Saturday of planning to destroy his country as renewed fighting near the airport of a major eastern city underscored the fragility of an eight-day ceasefire in the region.