By Angelo Amante and John Irish SCHLOSS ELMAU, Germany (Reuters) – The Group of Seven club of wealthy nations on Monday vowed to stand with Ukraine “for as long as it takes”, promising to tighten the squeeze on Russia’s finances with new sanctions that include a proposal to cap the price of Russian oil. The announcement came after Ukraine’s President Volodymyr Zelenskiy, addressing G7 leaders at their summit in the Bavarian Alps via a video link, asked for weapons and air defences to gain the upper hand in the war against Russia within months. But efforts to rally the Global South to the Ukrai…