LISBON (Reuters) – Ukrainian President Volodymyr Zelenskiy said on Thursday his war-ravaged country needed more heavy weapons to defend itself from Russia’s invasion that threatened Ukraine’s very survival, and he asked Western nations to impose further sanctions. Zelenskiy told Portugal’s parliament in a video address that the Portuguese, who next week celebrate 48 years since an almost bloodless revolution ended decades of fascist dictatorship, knew all too well what it meant to fight for democracy. “In 57 days of war, more than 1,000 Ukrainian towns were occupied by invaders who continue to…