European stocks fell Friday, with the Ukrainian crisis among the factors pressuring the market ahead of the weekend. The Stoxx Europe 600 index fell 0.6% to 334.11, as U.S. Secretary of State John Kerry urged Russia to de-escalate tensions in Ukraine, saying it would be an "expensive mistake" for Russia not to do so. Among individual decliners, shares of Tullow Oil PLC fell 2% after the company said it will abandon an exploration well in Mauritania because of a lack of discovery of hydrocarbons. But shares of Peugeot SA picked up 1.4% following the auto maker's rise in quarterly sales. The U.K.'s FTSE 100 index was down 0.3% at 6,681.63, Germany's DAX 30 index lost 1% to 9,452.40 and France's CAC 40 index lost 0.5% to 4,457.94.