By Angeliki Koutantou ATHENS (Reuters) -Greece has lined up additional supplies of pipeline gas and liquefied natural gas (LNG) should existing plans be disrupted by the Ukraine crisis, a government spokesperson said on Wednesday. Western nations on Tuesday punished Russia with new sanctions for ordering troops into breakaway regions of eastern Ukraine and threatened to go further if Moscow launched an all-out invasion. In perhaps the most significant measure announced on Tuesday, Germany halted certification of the Nord Stream 2 pipeline owned by Russian state-owned gas giant Gazprom, a move …