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.

Russian President Vladimir Putin said on Monday that Russia was not opposed to Europe's involvement in Russia-U.S. peace talks aimed at settling the conflict in Ukraine, but noted that Brussels had long rejected any dialogue with Moscow.

The U.S. voted against a U.N. resolution laying blame on Russia for its invasion of Ukraine and demanding Moscow remove its troops from Ukrainian territory.