FRANKFURT, GERMANYLufthansa Group said it would halt flights to Kiev and Odessa from Feb. 21, as concerns grew over whether Russia would invade Ukraine.

“The safety of our passengers and crew members is our top priority at all times,” the airline group said in a statement on Saturday. 

“Lufthansa continues to monitor the situation closely and is in close contact with national and international authorities.”

Besides Lufthansa, Lufthansa Groups also owns Austrian, Swiss International Airlines, and Eurowings.

KLM suspended its flights to Ukraine last week. Ukrainian International Airlines was forced to send five of its planes to Spain after a dispute over insurance coverage, but later said it was operating its flights as scheduled.

Another Ukrainian carrier, SkyUp Airlines, said one of its Ukraine-bound flights from Portuguese was forced to land in Moldova last weekend after the company that leases its jets said the carrier couldn’t enter Ukrainian airspace.