A top U.S. Senator wrote President Barack Obama on June 13 urging additional sanctions against Russia following reports of Russian tanks crossing into Ukraine.
Robert Menendez (Democrat-New Jersey), chairman of the Senate Foreign Relations Committee, encouraged the administration to excercise existing authority to "more agressively implement" an executive order imposing sanctions.
The Democratic senator said that while he recognized the importance of acting with Europe, the administration "should not hesitate to act unilaterally to support an independent Ukraine."
Republicans in the U.S. Senate have introduced their own bill introducing harsher sanctions against Russia, but it has failed to gain any Democratic co-sponsors.
Ukraine and Russia have accused each other of sending in armored vehicles across the border in recent days.
Based on a statement by Sen. Robert Menendez