Ukrainian President Volodymyr Zelensky said airlines and passengers should treat Russian airspace as "completely unsafe," according to the BBC and The Independent.

Ukraine has escalated deep-strike drone operations inside Russian territory, the BBC reported. Russia has said it will intensify its own attacks on Ukraine in response, according to the same report.

Chinese and Gulf state airlines are among the carriers still flying through Russian airspace, the BBC said. Most Western carriers have avoided Russian skies since Moscow's full-scale invasion of Ukraine began in 2022.

Why it matters: a war fought mainly with drones and missiles over Ukrainian and Russian territory now carries a direct warning to global aviation. Any strike on a civilian jet would draw in the airline's home country, insurers and international regulators, not just Kyiv and Moscow.

Hypothesis: longer-range Ukrainian drone strikes combined with Russian threats of retaliation raise the risk of a civilian aircraft being hit over or near Russian airspace, echoing the 2014 downing of Malaysia Airlines Flight MH17, in which 298 people died over separatist-held eastern Ukraine. Supporting this: a head of state is now warning airlines directly, and the strike campaign is expanding. Against this: no civilian aircraft has yet been struck in this war, and most major carriers already avoid Russian airspace.

What to watch: whether Chinese or Gulf carriers alter routing, and whether aviation regulators such as ICAO or national authorities issue fresh airspace advisories.