As the U.S. halts military aid to Kyiv, how long can Ukraine continue to fight Russia?

In a way, Zelenskyy is on the defensive and (Russian President Vladimir) Putin is going forward, and Trump seems to approve of that and seems to help Putin indirectly,

said Klaus Larres, distinguished professor of history and international affairs at the University of North Carolina at Chapel Hill

The quickest way of doing that is to hinder Ukraine's ability to continue fighting. And I think that's what Trump has been about virtually since he was elected,

said Graeme Gill, professor emeritus of government and international relations at the University of Sydney

No American company is going to invest in Ukraine until they're certain that the war is over and not going to start again,

said Gill

The quickest way to bring that peace is to bring the parties to the negotiating table,

he told CNA938

Zelenskyy and Trump seem to be clearly at loggerheads,

Larres told CNA’s Asia First

They're defending. They continue to display enormous resilience. But they are not winning, and that really creates a very delicate situation for the Ukrainians when it comes to negotiations,

he added

Then the Ukrainians won't be able to have the same level of situational awareness of the battlefield as they do now,

he said

They cannot obviously fully substitute the US,

he said

The president has been clear that he is focused on peace. We need our partners to be committed to that goal as well. We are pausing and reviewing our aid to ensure that it is contributing to a solution,

the officials confirmed to NBC News and other media outlets