Koruna's rise unsustainable - Czech's Tuma

Zdenek Tuma, the governor of the Czech National Bank, has described the koruna's appreciation against the euro and dollar as unsustainable.

"This is very strong appreciation, we cannot ignore it," Tuma told Bloomberg. ``By definition this pace of appreciation is unsustainable. That is clear.''

The koruna has appreciated by 7.5% against the euro and 16% against the dollar over the last five months. One euro was worth Kcs28.74 on 2 July but just Kcs26.70 on Monday. A greenback bought Kcs21.14 b