US President Donald Trump has gone all in with his effort to strongarm Kyiv into peace negotiations with Russia, suspending US military aid to Ukraine with immediate effect.

Washington's suspension of military assistance will not lead to a sudden collapse of Ukraine's defensive lines, but it could have a real impact on the war within months, undermining air defences and precision strike capabilities in particular.

As Ukraine tries to repair its fractured relations with the U.S. administration, Kyiv says it will be able to hold the sprawling front line in the ongoing war with Russia. But those fighting along it are worried by the decisions and tone coming from Washington.