By Patricia Zengerle and Mike Stone WASHINGTON (Reuters) -President Joe Biden’s administration authorized $100 million of additional military aid to Ukraine on Thursday, the latest in a series of transfers to help Kyiv repel Russia’s invasion, U.S. Secretary of State Antony Blinken said. The new transfers will be the tenth time that Biden has used his Presidential Drawdown Authority (PDA) to help Ukraine and would account for the $100 million remaining in that funding, which allows the president to authorize the transfer of excess weapons from U.S. stocks without congressional approval in resp…