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The vice-president said the US did not have immediate plans to expand the American military presence on the ground, but would invest more resources, including naval ships and military icebreakers.

But he will also accuse Putin of "playing games" with the agreement for a naval ceasefire, which would allow the reopening of trade routes in the Black Sea.

Zelensky said Ukraine has successfully tested its first domestically made ballistic weapon and upgraded its cruise missile Neptune to hit ground as well naval targets.

But Russia said the naval ceasefire would only come into force after a number of sanctions against its food and fertiliser trade were lifted.

On the leaked group chat, National Security Adviser Michael Waltz laments the state of Europe's naval forces.