By Carla Mozee, MarketWatch

LONDON (MarketWatch) -- European stocks dropped Friday, with German equities turning sharply lower, following reports of a flare-up in tensions between Ukraine and Russia.

Ukrainian forces destroyed part of a Russian military unit that was on Ukrainian soil, according to a Ukrainian military spokesperson quoted by various news sources. The spokesperson said Russian vehicles entered Ukraine through a section of the border held by rebels, which prompted the engagement, according to Bloomberg.

Ukraine President Petro Poroshenko's website said most of the Russian military vehicles that crossed into the country Thursday night have been destroyed.

Market reaction: The Stoxx Europe 600 index had been cruising higher, with intraday gains of roughly 1%, when news of the military confrontation came roughly 45 minutes before the end of trading. The pan-European index was then twisted lower, closing with a loss of 0.4% at 329.72.

The German DAX 30 index was yanked down 1.4% to 9,092.60, but had up by as much as 1.1% before the turnaround. The German economy -- the largest in Europe -- has been considered among the most vulnerable in the region to the impact of the conflict between Russia and Ukraine.

Investors also darted into so-called safe-haven assets, a move that pushed the yield on Germany's 10-year bond to an all-time low of 0.965% late Friday.

Russia's MICEX held to higher ground, ending up 0.7% at 1,417.82. The euro (EURUSD) bought $1.3389 compared with $1.3395 before reports of the confrontation. The shared currency bought $1.3367 late Thursday.

French stocks were hit, leaving the CAC 40 down 0.7% at 4,174.36. The U.K.'s FTSE 100 narrowed its gain, ending up 0.1% at 6,689.08. Also read: BHP outperforms FTSE 100.

In the U.S., the S&P 500 index (SPX) and the Dow Jones Industrial Average (DJI) reversed gains. (Read more about U:S: market action Friday http://www.marketwatch.com/story/us-stocks-futures-up-consumers-may-be-in-better-mood-2014-08-15.).

Movers

Here are some of the European companies whose shares were in focus Friday:

A.P. Moller-Maersk AS rose 0.7% as the Danish conglomerate was upgraded to overweight from neutral at J.P. Morgan Cazenove.

BHP Billiton Ltd. shares climbed 1.2%, as the world's largest mining company by market value said it favors spinning off a range of assets to focus more on commodities such as iron ore. Such a move could create a separately listed company valued at more than $8 billion.

Carillion PLC fell 4% after Balfour Beatty PLC again rejected the takeover offer from its rival in the construction sector.

Hennes & Mauritz AB tacked on 0.7% following a 17% rise in total July sales at the Swedish fashion retailer, known for its H&M stores.

For the week, the Stoxx 600 index closed up 1.5%.

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