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Tension is ratcheting up between President Putin and members of Nato over the threat of an invasion into Ukraine.

The Secretary General of Nato says the risk of conflict between Russia and Ukraine is real. Vladimir Putin continues to build up troops and weapons, but insists Russia will not invade.

The US’s top diplomat, Antony Blinken, is in Europe vowing relentless diplomacy to stop Russian aggression and is heading to Geneva to meet the Russian foreign minister.

What’s Putin’s next move?

Diplomatic editor Mark Urban reports. Kirsty Wark is joined by Fiona Hill, former Russia director of the White House’s National Security Council and Tobias Ellwood, Conservative MP and chair of the defence select committee.