The Russian MICEX index closed up around 3.5 percent and all major European bourses ended higher.
The U.K.'s benchmark FTSE 100 ended up around 0.7 percent, underperforming the French CAC 40 and the German DAX, which closed provisionally 0.9 percent and 1.1 percent higher, respectively.
Read MoreStocks spike amid confusion over Ukraine cease-fire
Downward pressure on the U.K. index came from the weak performance in some of the major mining companies. Stocks like BHP Billiton and Rio Tinto have come under pressure in recent weeks as iron prices have approached five-year lows.
Meanwhile, U.S.,stocks shaved early gains to trade mixed on Wednesday, amid the possibility of easing tensions between Ukraine and Russia.
Handbag war truce
France's LVMH agreed not to purchase any shares in rival Hermes for the next five years on Wednesday, burying hopes the bigger luxury group would make a full takeover bid.
Shares of Hermes traded down as much as 9 percent during the session, before paring losses to close around 2.6 percent in the red. LVMH shares closed around 2.9 percent higher on the news.
Read More'Standoff' of French luxury companies ends
Hugo Boss shares closed down around 5.7 percent, after the investment vehicle of Permira Holdings decided to reduce its stake in the German firm.
Meanwhile, FTSE 100-listed equipment rental firm Ashtead rose by around 3.6 percent after the company raised its full-year guidance and reported a profit surge in the first half of its trading year.
A second reading for the euro zone's composite purchasing managers' index (PMI) showed that business in the region grew at its weakest pace this year last month. PMI fell to an eight-month low of 52.5, below July's reading of 53.8.
The new figures come ahead of a rate decision by the European Central Bank (ECB) on Thursday. Some analysts are anticipating that the ECB could announce some more stimulus measures.
"Feeble inflation data and weak activity reads in manufacturing and services, coupled with Mario Draghi's comments at the June meeting highlight that QE (quantitative easing) is certainly a policy tool of the future," Evan Lucas, market strategist at IG, said in a research note.