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South Sydney great Sam Burgess has denied driving with cocaine in his system, despite testing positive after being pulled over for a roadside test.

NSW Police confirmed to AAP that a 34-year-old man was stopped in the Sydney suburb of Kingsford for roadside testing at about 10am Thursday and subsequently taken to a nearby station after testing positive for an illicit substance.

The driver underwent secondary testing and was issued a notice to appear at Waverley Local Court on February 15 for driving unregistered.

"Inquiries are continuing, and police will await the result of a secondary oral fluid analysis," a police statement said.

On Thursday evening, Burgess took to social media to deny he had driven with drugs in his system.

"After I was released from the police station, I immediately and voluntarily went to an independent, internationally accredited testing facility and undertook a urine test," he wrote in a statement.

"I deny any suggestion that I have drugs in my system. I have not consumed, obtained, or possessed any illicit drugs."

Burgess played 182 games for the Rabbitohs between 2010 and 2019 and won the Clive Churchill Medal as man of the match in the club's drought-breaking 2014 grand final win.

In March, the NRL fined Burgess $30,000 for using illicit drugs and threatening another player in 2018, and driving with traces of cocaine in his system in February 2021 while working at the Rabbitohs in an off-field role.

For the latter incident, Burgess avoided conviction but was placed on a nine-month good behaviour bond.

The NRL also suspended him from official duties with South Sydney for 12 weeks and any further sanctions could impinge on his hopes of launching a professional coaching career.

"I have made positive improvements to my life and to my driving since my full licence was returned to me following a 10-month loss of licence," Burgess' statement read on Thursday.

"I have undertaken road safety courses and since then I have not incurred any demerit points or any fines.

"I am clean and sober from drugs, living a happy, healthy and balanced life."

© AAP 2022

President Volodymyr Zelenskiy has told the United States Congress aid to Ukraine is an investment in democracy and "not charity" as he invoked American battles against the Nazis in World War II to press for more assistance for his country's war effort.

Zelenskiy's comments on Wednesday come as Republicans - some of whom have voiced increasing scepticism about sending so much aid to Ukraine - are set to take control of the US House of Representatives from Democrats on January 3.

Some hardline Republicans have even urged an end to aid and an audit to trace how allocated money has been spent.

"Your money is not charity. It is an investment in the global security and democracy that we handle in the most responsible way," Zelenskiy told a joint session of the US Senate and House of Representatives, speaking in English.

The world is too interconnected to allow any country to stand aside and feel safe, Zelenskiy said as he appealed for bipartisan support.

Earlier, Zelenskiy, wearing his trademark olive green trousers and sweater on his first foreign wartime visit, met President Joe Biden, who called for support to keep flowing in 2023.

The US also announced another $US1.85 billion ($A2.74 billion) in military aid for Ukraine, including a Patriot air defence system to help it ward off barrages of Russian missiles.

Zelenskiy said the Patriot system was an important step in creating an air shield.

"This is the only way that we can deprive the terrorist state of its main instrument of terror - the possibility to hit our cities, our energy," Zelenskiy told a White House news conference, standing next to Biden.

"We would like to get more Patriots ... we are in war," Zelenskiy told reporters at the White House.

Russia says it launched its "special military operation" in Ukraine in February to rid it of nationalists and protect Russian-speaking communities.

Ukraine and the West describe Russia's actions as an unprovoked war of aggression.

Ukraine has come under repeated Russian strikes targeting its energy infrastructure in recent weeks, leaving millions without power or running water in the dead of a freezing winter.

TASS news agency cited Russia's US ambassador as saying that Zelenskiy's visit confirmed US statements about not wanting a conflict with Russia were empty words.

America's provocative actions in Ukraine were leading to an escalation the consequences of which were impossible to imagine, TASS cited Anatoly Antonov as saying.

Russia said last week Patriot systems, if delivered to Ukraine, would be a legitimate target for Russian strikes.

Zelenskiy joined a long list of world leaders to address joint meetings of the US Senate and House, a tradition that began in 1874 with a visit by Hawaiian King Kalakaua and included almost legendary wartime visits by British Prime Minister Winston Churchill, kings, queens and one pope.

Congress is on the verge of approving an additional $US44.9 billion ($A66.4 billion) in emergency military and economic assistance, on top of some $US50 billion ($A74 billion) already sent to Ukraine this year as Europe's biggest land conflict since World War II drags on.

White House National Security Council spokesman John Kirby said Washington had not seen any signs Russian President Vladimir Putin was willing to engage in peacemaking.

Russian forces attacked targets in the Zaporizhzhia region and pushed to advance near the battered eastern front-line towns of Bakhmut and Avdiivka, the focal point of fighting in the Donetsk region, Ukraine's military said on Wednesday evening.

Putin has promised to give his military whatever it needs to prosecute the war, which is nearing the end of its 10th month.

© RAW 2022

The Queensland police officers fatally shot while making a welfare call at a Western Downs property last week also had plans to arrest one of the gunmen.

Constables Rachel McCrow and Matthew Arnold, and neighbour Alan Dare, were ambushed and killed by Nathaniel, Gareth and Stacey Train at the Wieambilla residence, three hours west of Brisbane, on December 12.

The Trains were all later shot dead in a gunfight with police reinforcements.

Four constables initially went to the property to check on Nathaniel Train after he was reported missing by his wife but also planned to take the former school principal into custody.

Deputy Police Commissioner Tracey Lindford said on Thursday Nathaniel Train was wanted on an outstanding warrant for damaging a border gate while entering the state from NSW and dumping two unregistered guns near a creek on December 17, 2021.

"The reason they were going there was because of the warrant and the events of December last year, and the missing person report," she told reporters.

Local officers had been trying to call the Trains about the warrant and had gone to the property to arrest the younger of the brothers multiple times over the past year but no one was ever home.

"I don't know the exact number but it was multiple visits by local police to try and talk to or try and locate Nathaniel Train in the first instance, but to talk to him about the incident back in December, and they were unable to locate him," Ms Lindford said.

The deputy commissioner said local officers had never found any red flags about the Trains, who weren't on any police watch lists either.

Despite the apparent lack of danger, last Monday's house call ended shockingly differently for police than all their earlier visits.

"This was a run-of-the-mill policing job," Ms Lindford said.

"Our police attend addresses every day of the week and execute warrants on individuals, and given the fact we had very little history or knowledge about or any concerning behaviour about Nathaniel Train, there wasn't anything to flag particular concern with our members who were attending the scene that day."

Detectives are still working out the Trains' motive after ruling out domestic terrorism and are probing their social media posts and bank accounts.

"What we can see is sentiment displayed by the three individuals, or three Train family members, that appears anti-government, anti-police, conspiracy theorist type things," Ms Lindford said.

"But we can't see them connected to any particular group they might have been working with or inspiring them to do anything. We haven't had anything like that at this point in time."

Police have also seized six guns - two registered to Nathaniel Train, three unregistered and one of unclear ownership - as well as compound bows, arrows and knives from the property.

Those details come a day after thousands of people bid an emotional farewell to Constables McCrow and Arnold at a memorial where Police Chaplain Jeffrey Baills urged people to remain stoic in their grief.

"We have had a major attack on the police in Queensland but, ladies and gentlemen, I want to say to us today, 'we will not be broken'," he said.

The two officers were awarded valour medals at the ceremony at the Brisbane Entertainment Centre.

Police Commissioner Katarina Carroll has posthumously awarded the bravery medal to Mr Dare, who will be farewelled at a private funeral in Ipswich on Friday.

© AAP 2022