BELGRADE (AFP) — Serb ultra-nationalist lawmakers held up insulting signs in parliament Wednesday as US Vice President Joe Biden, considered a strong backer of Kosovo independence, arrived in Belgrade. "Biden, you Nazi scum, go home," said the posters brandished by opposition Radical Party deputies during the live national broadcast of a parliament sitting which coincided with the start of Biden's visit. The Radicals, who occupy around a fifth of places in the 250-seat assembly, then pasted the signs which also labelled Biden a "fascist" on a notice board and hallway.