Oil prices rose on Tuesday, recouping some of their losses on Monday as rising tension in Eastern Europe and the Middle East heightened fears of a supply shortage.
Brent crude futures rose 60 cents, or 0.7 percent, to $86.87 a barrel, after falling 1.8 percent in the previous session.
US West Texas Intermediate crude futures rose 45 cents, or 0.5 percent, to $83.76 a barrel, after falling 2.2 percent on Monday.
Oil prices rose to their highest levels in seven years last week, supported by a lack of supply at the world level and rising global demand.
NATO said on Monday that the alliance is putting its forces on alert and beefing up its deployment in eastern Europe with more ships and fighters in response to the growing Russian military buildup on the Ukrainian border.
In the Middle East, the Iran-aligned Houthi movement launched a missile attack on the UAE, targeting a base hosting US forces. Still, US and UAE officials said US Patriot missiles repelled the attack.