FOREX-Euro drops vs dollar, pound on worry over Russia sanctions hit

* EU threatens Russia with harsher sanctions LONDON, July 23 (Reuters) - The euro hit an eight-month low against the dollar on Wednesday as worries over tougher sanctions on Russia and their potential impact on fragile euro zone growth drove investors away from the single currency. Harsher steps could be a particular hit to euro zone powerhouse Germany given its strong trade links with Russia ...