There's scepticism over whether European countries would be willing to provide more security in Ukraine.
US President Donald Trump has warned of imposing high levels of sanctions, taxes and tariffs on Russia to try to force a ceasefire deal.
Ukraine's Volodymyr Zelenskky says any deal would need at least 200,000 peacekeepers on the border.
But Keir Giles —a Russian expert with international think tank Chatham House— told Ryan Bridge countries are worried about how much taking an interest in their own defence would cost them.
He says that's been one of the main concerns in Europe with Trump's re-election, and his promise he may not meet the US's NATO commitments when called upon.
LISTEN ABOVE
See omnystudio.com/listener for privacy information.
The Mike Hosking Breakfast