Biden administration officials have been talking with Qatar about possibly supplying Europe with liquefied natural gas if a Russian invasion of Ukraine leads to shortages, according to people familiar with the matter.

U.S. President Joe Biden plans to ask the Persian Gulf nation’s emir, Sheikh Tamim bin Hamad Al Thani, to visit the White House, possibly as soon as later this month, two of the people said on Friday. The meeting between Biden and the emir has been in the works for some time, a White House official said Friday night.

Some European nations have expressed fears that punishing Russia with harsh sanctions over the Ukraine crisis could wind up damaging their economies and prompt Russian President Vladimir Putin to cut off or scale back gas supplies in the middle of the winter.