Alliance member states have been sounding the alarm about Europe's collective security amid Russia's full-scale invasion of Ukraine.

President Donald Trump has called for a sweeping overhaul of the US military that could affect Washington's role in NATO as well as cooperation with Europe and support for Ukraine against Russia. But social media posts that say the US leader closed a military base in Greece are false -- Trump himself denied the claims and a Pentagon official told AFP the facility is not America's to close .

As the re-elected US president threatened to slap 25 per cent tariffs on imports from the EU and demurred on security guarantees for Ukraine and Nato, our expert panel took FT subscribers’ questions on the following topics and more: Will EU countries shoulder more of their own defence and build up a co-ordinated defence industry as Trump eyes talks to end Russia’s war on Ukraine bypassing Ukraine?

The simple reality is that America spends 70 percent of the NATO defense budget. All the other nations combined spend about 30 percent.

Germany's likely next Chancellor Friedrich Merz questioned on Sunday whether NATO would remain in its "current form" by June in light of comments by U.S. President Donald Trump's administration, and said Europe must quickly establish an independent defence capability.

Former French President François Hollande asserts that President Donald Trump and his administration are “no longer” allies, saying a U.S.-Europe “divorce” could be on the horizon.  Read More

The Greatest Generation lost over 400,000 men fighting fascism in Europe and Asia. Once the enemy was defeated, American money helped Europe rebuild. Then we created NATO to stand against Russia.

By doing so, the United States is condoning Russia’s subversion of the postwar Europe that America helped create and secure. The parties Russia favors are hostile to the European Union, opposed to higher military spending and receptive to Russia’s arguments about the recklessness of NATO expansion and the need to assert right-wing Christian values.

It created a single security space among the democratic nations in North America and Europe. The concept of a one-for-all, indivisible security across the North Atlantic has been remarkably successful in deterring attacks against NATO members.

As we hit the three-year mark since the invasion of Ukraine by Russian forces, Europe and NATO appear to be at their most fractured and vulnerable.