In a war dominated by the unexpected, few imagined Ukraine’s fourth year at war would so firmly now question the security of all of Europe.

The U.S. is lobbying countries around the world to oppose a resolution brought forward at the U.N. General Assembly by Ukraine and European countries.

By Tom Balmforth, Max Hunder and Yuliia Dysa KYIV (Reuters) -Ukraine hosted European leaders on Monday to mark three years of all-out war with Russia since Moscow's invasion, while top U.S. officials stayed away in a clear illustration of President Donald Trump's lurch towards Moscow since returning to power.