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 the two countries’ accession documents, easily surpassing the two-thirds majority of 67 votes required to support ratification of the two countries’ accession documents. Sweden and Finland applied for NATO membership in response to the invasion of Ukraine by Russia, which has repeatedly warned both again…