Visits come amid a rift between Trump and Ukrainian President Volodymyr Zelenskyy

The talks come amid deep uncertainty about the future of transatlantic relations and U.S. support for Ukraine.

'You can’t be weak in the face of President Putin. It’s not you, it’s not your trademark, it’s not in your interest. How can you then be credible in the face of China if you’re weak in the face of Putin?'”