LONDON—Oil extended gains to seven-year highs above $90 a barrel on Thursday as the Ukraine crisis outweighed signs that the U.S. Federal Reserve will tighten monetary policy.
Brent crude futures were up 89 cents, or 1 percent, at $90.85 a barrel by 1217 GMT. U.S. West Texas Intermediate (WTI) crude futures were up 87 cents, or 1 percent, at $88.22.





