WASHINGTON, May 23 (AFP) - Some 20 countries offered new security assistance packages for Ukraine to battle invading Russian forces in a meeting of allies on Monday (May 23), US Secretary of Defense Lloyd Austin announced.

In their second gathering, nearly four dozen countries and organisations forming the Ukraine Defense Contact Group met online to discuss helping Ukraine, and 20 nations pledged arms, ammunition and other supplies to support Kyiv.

The group was briefed by Ukraine Defence Minister Oleksiy Reznikov on the current situation of the three-month-old war, in which the two sides are fighting along a long front line over territory Russia has seized in Ukraine's east and south.

"Today, together with Minister Reznikov and his team, we've gained a sharper and shared sense of Ukraine's priority requirements and the situation on the battlefield," Austin said.

"Many countries are donating critically needed artillery ammunition, coastal defence systems and tanks and other armoured vehicles," he said.

Others, he added, are offering training for Ukraine's military.

He said that Denmark committed to send a Harpoon anti-ship missile system, and the Czech Republic was offering attack helicopters, tanks and rocket systems.

Harpoons are cruise missiles that can skim the surface of the sea to target ships as far as 300 kilometres offshore, depending on the type.

Usually Harpoons are mounted aboard ships or aircraft, but Denmark is the only country that acquired land-based systems for coastal protection.

The Danish battery would add a layer of protection to Ukraine's Black Sea port of Odessa, which is believed to be under threat of Russian invasion from the sea.

They could also potentially reach the port of Sevastopol, where some of the Russian Black Sea fleet is based.

Austin would not provide details of what is included in a new US$40 billion US assistance package for Ukraine, amid speculation that it could include high-precision, long-distance rockets that could be used to hit Russian territory.