* Russian-supplied Iskander tactical missile systems, which are capable of carrying nuclear warheads, and S-400 air defence systems have been deployed to Belarus and are prepared to perform their intended tasks, a senior Belarusian defence ministry official said on Sunday. * A top Ukrainian presidential aide called for the "liquidation" of Iranian factories making drones and missiles, as well as the arrest of their suppliers, as Kyiv accused Tehran of planning to supply more weapons to Russia.