By Patricia Zengerle WASHINGTON (Reuters) – The U.S. Senate approved on Wednesday Finland and Sweden’s accession to NATO, the most significant expansion of the 30-member alliance since the 1990s as it responds to Russia’s invasion of Ukraine. The Senate voted 95 to 1 to support ratification of accession documents, easily surpassing the two-thirds majority of 67 votes required to support ratification of the two countries’ accession documents. “This historic vote sends an important signal of the sustained, bipartisan U.S. commitment to NATO, and to ensuring our Alliance is prepared to meet the c…