Russian President Vladimir Putin arrives in Brisbane where he's likely to meet a storm of criticism.br br Australia's G20 summit is expected to produce a showdown between Western leaders and Putin, following new reports of Russian troops pouring into eastern Ukraine.br br After several months of fighting, a ceasefire is supposed to be in effect.br br But Kiev says Russia is sending soldiers and weapons to help separatist rebels in the east launch a NEW offensive.br br Putin denies the accusations and in interview with Russian journalists, blasted the U.S. and European Union -- saying the sanctions they've imposed on Russia have harmed the global economy.br br (SOUNDBITE) (Russian) RUSSIAN PRESIDENT, VLADIMIR PUTIN, SAYING (AUDIO STARTS OVER SHOT OF REPORTER LISTENING):br br "...It undermines the whole system of international economic relations.