Ukrainian President Volodymyr Zelensky on Monday asked the Group of Seven rich nations to further squeeze Russia over its invasion of Ukraine by capping prices of oil exported by Moscow. 

"For us, a consistent position of the G7 countries on sanctions is important. They must be further strengthened, by limiting the prices of oil exported by the aggressor," Zelensky wrote on his Telegram account after addressing a G7 leaders meeting in Germany via video-link. 

He added that "Ukraine feels the support of the G7 countries". 

"Thank you for the defence and financial aid given to our country in its fight against the Russian invasion," he said.

Zelensky also called for "modern anti-missile defence" and "sufficient supply of weapons" to be delivered to Ukraine. 

Zelensky asked the G7 leaders to recognise "Russia as a country that sponsors terrorism" and raised the issue of Ukraine's post-war restoration, "which will be the biggest economy project of our time".

He also called for a "resumption of agricultural exports" as grain remains blocked in Ukrainian ports fuels a global food shortage and drive us food prices.

A senior US official told reporters Monday that negotiations on how to cap the amount of money the Russians can get for their key oil exports were advancing.

The United States and Canada, which are far less reliant on Russia as an energy supplier than Europe, have banned all Russian oil imports. 

The European Union, however, has introduced a gradual oil embargo as part of its sanctions on Moscow.