Sen. Bob CorkerRobert (Bob) Phillips CorkerOPINION: Congress should censure Trump for his unfit conduct How to fix Fannie and Freddie to give Americans affordable housing No. 2 Senate Republican backs McConnell in Trump fight MORE (R-Tenn.) is calling on NATO countries to provide Ukraine with lethal military aid in its fight against Russia.

“The plans announced for NATO's future are good to hear, but the best show of our resolve today would be to immediately and robustly share intelligence inside Ukraine, provide appropriate lethal support to the Ukrainian government, and impose additional crippling sanctions until Russia ends its aggression,” Corker said on Wednesday.

He made the comments as Gen. Philip Breedlove said NATO countries would announce possibly increasing aid by the end of the week. President Obama missed the start of those NATO meetings on Thursday.

The Obama administration has increased sanctions again Russia since its invasion of Crimea and continued support of separatists in eastern Ukraine. The United States has also given Ukraine non-lethal military equipment including night-vision goggles and medical supplies. Corker said the U.S. should do more to help Ukraine defend itself against Russian President Vladimir Putin. 

“Despite its denials, Russia has, in fact, invaded Ukraine, and the United States and the [European Union] must respond as they have said they would, rather than continue this alarming lack of resolve that has led to a near-dismantlement of Ukraine,” said Corker, who serves as ranking member on the Senate Foreign Relations Committee. 

Corker also called for Senate passage of his bill that would authorize military assistance for non-NATO allies Ukraine, Moldova and Georgia.