US President Joe Biden has made an unannounced visit to Ukraine, a major show of support ahead of the one-year anniversary of Russia’s invasion which has seen Moscow launch a massive assault across frontlines in the east.

Air raid sirens blared across the Ukrainian capital on Monday as Mr Biden visited Kyiv, but there were no reports of Russian missile or air strikes.

President Volodymyr Zelensky said he and Mr Biden discussed long-range weapons during the visit.

The White House said Mr Biden would announce more sanctions on Russia and military support for Ukraine.

Mr Biden arrived in the Ukrainian capital a day before President Vladimir Putin was due to make a major address, expected to set out Russia’s aims for the second year of the invasion he launched on February 24 last year.

The anniversary has taken on more than symbolic significance, becoming what the West views as motivation for the war’s deadliest phase as Moscow hurls thousands of conscripts and mercenaries into a winter offensive.

Russia has secured only scant gains so far in assaults in frozen trenches up and down the eastern front in recent weeks.

Kyiv and the West see it as a push to give Putin victories to tout a year after he launched Europe’s biggest war since World War II.

-Reuters