Russia's Putin vows retaliation after accusing Ukraine of hitting student dormitory

Russian President Vladimir Putin has promised retaliation after accusing Ukraine of carrying out a deadly attack on a student dormitory in an occupied part of eastern Ukraine.Six people were killed and 39 injured in the overnight strike in the town of Starobilsk, Luhansk region, Putin said. Another 15 people were missing.Ukraine's military said it hit the headquarters of Russia's elite Rubicon drone military unit in Starobilsk. It did not say whether it was the same building as the one identified by Russia."There are no military facilities, intelligence service facilities, or related services in the vicinity," Putin said in Moscow. "Therefore, there is absolutely no basis for claiming that the munitions struck the building as a result of our air defence or electronic warfare systems," he said at a reception in his Kremlin residence on Friday.He ordered the Russian military to prepare its "proposals" on how to retaliate.The Russian leader said the Ukrainian strike had been carried out in three waves using 16 drones. Russia's state-run TV showed what it said was one of the injured students, identifying her as Diana Shovkun, aged 19.