Ukraine began its long-anticipated counteroffensive last month but has so far made only small gains against well entrenched Russian forces who control more than a sixth of its territory after nearly 17 months of war.

US Secretary of State Antony Blinken said on Sunday that Ukraine has taken back about half of the territory seized by Moscow.

“It’s already taken back about 50 per cent of what was initially seized,” Blinken told CNN, adding that “these are still relatively early days of the counteroffensive”.

He said “we’re still looking, I think, at several months”.

Putin said Lukashenko’s visit to Russia would continue through Monday. The two leaders visited a naval museum on Sunday.

A Telegram channel linked to Lukashenko quoted him as saying in a jocular tone that fighters of Russia’s Wagner mercenary group who are now training Belarus’s army were keen to push across the border into Nato member Poland.

“The Wagner guys have started to stress us – they want to go west. ‘Let’s go on a trip to Warsaw and Rzeszow’,” he was quoted as saying. There was no indication that Lukashenko was seriously entertaining that idea.

On Thursday, the Belarusian defence ministry said Wagner fighters had started to train Belarusian special forces at a military range just a few miles from the Polish border.

Poland is moving extra troops towards the border with Belarus in response to the arrival of the Wagner forces who relocated there after staging a short-lived mutiny in Russia last month.

Putin, in response, warned Poland on Friday that any aggression against Belarus would be considered an attack on Russia. He said Moscow would use all means it has to react to any hostility towards Minsk.

Useful partner

Russia and Belarus are linked in a partnership called the “union state” in which Moscow is by far the dominant player. But Lukashenko has proved his usefulness to Putin since the invasion of Ukraine began in February 2022, allowing Russia to use his country as a launch pad at the start of the war.

He has subsequently let Russian forces train at his military bases, conducted frequent joint exercises and taken delivery of tactical nuclear weapons which Putin has placed in Belarus in a move broadly condemned in the West.

The Kremlin also credited Lukashenko with brokering last month’s deal to end the Wagner mutiny, which Putin said had briefly threatened to tip Russia into civil war.

Putin said the two leaders would meet on Sunday and Monday and would discuss security and other issues “in great detail and in depth”.

Lukashenko has not committed his small army to join Russia’s war, but the risk of a new attack from Belarusian soil compels Ukraine to protect its northern border, stretching its forces as it tries to step up its counteroffensive in the east and south of the country.

Additional reporting by dpa