By Tatyana Shumsky 

NEW YORK--Palladium prices closed higher, but pulled back from 13-year highs, as investors await the European Union's decision on new economic sanctions against Russia, while gold prices were flat as traders watched for new developments in Eastern Europe and the Middle East.

Palladium for September delivery, the most active contract, settled 95 cents, or 0.1%, higher at $880.75 a troy ounce on the New York Mercantile Exchange. The contract reached an intraday high of $899.90, the highest level since February 2001.

Investors have flocked to palladium this year amid worries about supply from two of the world's largest producers. A mine-worker strike in South Africa, which ran from January to June, had taken roughly 30% of the world's palladium supply offline for five months.

Meanwhile, tensions between Russia and the West over Moscow's support for separatist fighters in Ukraine has led to several rounds of economic sanctions. Some investors worry that access to Russia's palladium output, which accounts for about 40% of global supply, could be disrupted by further trading curbs.

"If you have any kind of threat to supply, there's a rush to stockpile," said George Gero, a senior vice president with RBC Capital Markets Global Futures.

On Monday, European Union officials began a two-day meeting in Brussels to discuss economic sanctions that would restrict Russian access to European capital markets and prohibit exports of militarily sensitive goods, energy-sector technology and arms to Russia. Germany, one of Russia's largest trading partners, has expressed its willingness to back the targeted measures even if they pressure some domestic companies.

The move comes after a Malaysian Airline passenger jet was shot down at the Ukraine-Russia border earlier this month, killing almost 300 people.

Some investors worry that Moscow could retaliate against the West by halting its palladium exports. The precious metal is widely used in car exhaust filters, where it helps to break down air pollutants.

In other markets, gold prices settled unchanged at $1,303.30 a troy ounce on the Comex division of the Nymex.

Write to Tatyana Shumsky at tatyana.shumsky@wsj.com