Lawmakers upped the pressure on the Biden administration to send M1 Abrams tanks to Ukraine on Sunday as Russian officials warned of a „global catastrophe“ if more powerful weapons are supplied to Kyiv. 

Sens. Lindsey Graham, R-S.C., Richard Blumenthal, D-Conn., and Sheldon Whitehouse, D-R.I., visited Kyiv and met with Ukrainian President Volodymyr Zelenskyy over the weekend.