“I think Russia, we're going to discover, is in a very, very difficult place, certainly in its depth of its reserves and its morale and that will make every meter they fight for even harder. And at the same time, we're now going to see some of these heavier weapons coming into the hands of Ukraine delivered into the country and that will again change the balance.”

Wallace added that Russia will be “desperately trying to find some form of victory no matter how small to make its morale feel a bit better,” but was not confident for how long Russia can sustain this offensive.

“Russia has been in the field for months; remember, they were predominantly deployed three months before the invasion. No army is designed to be a conscript army out in the field that way, badly equipped, suffering huge losses,” he said.