Ukrainian airspace is currently closed after the Russian invasion. Ukraine's neighbor Moldova has also closed its airspace, as has parts of Belarus.
Meanwhile, the US government's Federal Aviation Administration has told US pilots to avoid "the whole country of Ukraine, the whole country of Belarus and parts of western Russia."
Britain has banned Russian civilian aircraft from its airspace. In response, Russia has banned British aircraft from its airspace.
Several commercial airlines, including Lufthansa and Air France, had suspended flights to Ukraine earlier this week as tensions escalated.
Countries including the United States and Britain have advised their citizens to leave Ukraine.
The US government issued a travel warning on February 12, 2022 to ban travel to Ukraine "because of the growing threat of Russian military action" as well as ongoing concerns about Covid-19.
The British government also advised against all travel to Ukraine, explaining that "the possibility of commercial routes out of Ukraine will be severely disrupted and roads crossing Ukraine may be closed."
The European Union Aviation Safety Agency, known as EASA, has warned of a "high risk" for civilian aircraft flying near the Ukrainian border.
Air traffic is still moving outside the severely affected areas. In addition to borders with Russia, Ukraine is also neighbors with Belarus, Poland, Slovakia, Hungary, Romania, and Moldova.
The European Union's Aviation Safety Agency said "operators must exercise extreme caution" and avoid using airspace within 100 nautical miles of the Russia-Ukraine border.