Russian President Dmitry Medvedev has agreed to step up sanctions against Libya, the Kremlin said Friday. The move comes five months after the UN Security Council passed an identical measure in March. The decree includes a ban on the use of Russian airspace by Libyan planes and a freeze on the assets of Moammar Gadhafi and his close allies. Medvedev signed an earlier sanctions decree in March that banned weapons sales to the embattled Gadhafi regime. Before the current conflict, Russia was a key arms supplier to Libya.