For full coverage of the crisis in Ukraine, visit .

Ukraine's southern front-line city of Mykolaiv will impose an unusually long curfew from late Friday to early Monday morning as authorities try to catch people collaborating with Russia, the region's governor said.

Latest Developments in Ukraine: August 5

Mykolaiv, which has been shelled throughout Russia's invasion, which began on February 24, lies close to Russian-occupied parts of the strategically important region of Kherson where Ukraine plans to conduct a counteroffensive.

Latest Developments in Ukraine: August 5

Vitaliy Kim, governor of the Mykolaiv region, told residents the curfew running from 11 p.m. (2000 GMT) Friday to 5 a.m. Monday did not mean the city was under threat or facing a looming attack.

Latest Developments in Ukraine: August 5

"There's no sign of an encirclement. The city will be closed for the weekend. Please be understanding. We are also working on collaborators. Districts will undergo checks," Kim said on Telegram.

Russia is imposing entry bans on 62 Canadian citizens including government officials in a retaliatory move, it said Friday, according to Agence France-Presse.

The Russian foreign ministry said in a statement that the list included figures known for "their malicious activity in the fight against the 'Russian world' and our traditional values."

Moscow said the bans came in retaliation for Canada's sanctions against Russian figures including journalists and the head of the Russian Orthodox Church, Patriarch Kirill, in June and July.

Russia also accused Canadian Prime Minister Justin Trudeau's government of aiming to insult "not only the multinational and multi-confessional people of Russia, but also Orthodox believers around the world, including Canada."

A European Union plan to cut gas use and help Germany wean itself off dependency on Russia will come into effect early next week, the bloc's presidency said Friday, according to Agence France-Presse

Last week, EU member states agreed to reduce their use of gas by 15% over the winter, with exceptions for some countries and despite opposition from Hungary.

Officials have since been working on the legal texts of the plan, which will be voluntary unless the member states agree to give the European Commission emergency powers.

The EU's rotating presidency, held by the Czech Republic, announced Friday the Council of the European Union, which represents member states, had formally adopted the plan.

A diplomatic source told AFP that the plan would come into effect on Tuesday.

Russia and Ukraine on Friday accused each other of shelling the Zaporizhzhia nuclear power plant, the biggest of its kind in Europe, and laying the ground for a potential disaster.

Russia's defense ministry said it was only by luck that a radiation accident had been avoided after what it described as an artillery barrage.

Ukrainian President Volodymyr Zelenskyy said Moscow was responsible and accused it of committing "an open, brazen crime, an act of terror."

The Russian defense ministry said the generating capacity of one unit had been reduced and power supply to another had been cut. In addition, the nearby city of Enerhodar had power and water supply problems, it said.

Enerhodar and the nearby nuclear plant were seized by invading Russian troops in early March and are still close to the frontline.

The Biden administration's next security assistance package for Ukraine is expected to be $1 billion, one of the largest so far, and include munitions for long-range weapons and armored medical transport vehicles, three sources briefed on the matter told Reuters on Friday.

The package is expected to be announced as early as Monday and would add to about $8.8 billion in aid the United States has given Ukraine since Russia's invasion on Feb. 24.

The officials, speaking on the condition of anonymity, said that President Joe Biden had not yet signed the next weapons package. They cautioned that weapons packages can change in value and content before they are signed.

However, if signed in its current form, it would be valued at $1 billion and include munitions for HIMARS, NASAMS surface-to-air missile system ammunition and as many as 50 M113 armored medical transports.

Greece’s decision to limit air conditioning in public buildings as a result to Europe’s energy shortfall, it has turned fraught, raising questions of which parts of society should be asked to make sacrifices, and for what. Greeks are asking what they should be sacrificing for Ukraine after years of suffering under austerity that cut pensions and slashed government spending. And they question how much they should help energy challenges in Germany, which they blame for a decade of economic depression and suffering, .