Aryna Sabalenka was not allowed to play at Wimbledon last year because of the ban on Belarusian and Russian players but can compete this yearWimbledon is set to donate more than £500,000 to Ukraine relief after the "difficult decision" to lift its ban on Russian and Belarusian players.
The All England Club (AELTC) and Lawn Tennis Association (LTA) will also fund accommodation for Ukrainian players.
Russians and Belarusians were not allowed to play last year in response to Russia's invasion of Ukraine.
Chairman Ian Hewitt said lifting the ban did not lessen the AELTC's "total condemnation" of the invasion.
Wimbledon and British tennis' governing body the LTA were punished for their stance last year by the WTA and ATP with heavy fines and the removal of ranking points, and overturned the ban last month.
"This was an incredibly difficult decision. I personally say that I found this probably the most difficult decision during my chairmanship," Hewitt, who is standing down at the end of this year's championships, told the annual Wimbledon spring news conference on Tuesday.
Announcing a series of financial measures to support Ukrainians, Hewitt said £1 for every ticket holder would be donated to Ukrainian relief, which could amount to more than £500,000.
He also said the AELTC and LTA would pay for two hotel rooms per Ukrainian player in the Wimbledon main or qualifying draws for the whole grass-court season.
Those players will also be invited to practise on the Wimbledon or Surbiton courts during that time, while 1,000 Ukrainian refugees will be invited for a day at the Grand Slam, which runs from 3 to 16 July.
Russians or Belarusians wishing to play at Wimbledon must sign a declaration indicating their neutrality, that they will not demonstrate any support for the war or receive financial backing from their states or companies linked to them.
Flags from either country or any other symbols of support will also be banned from the grounds.
Several players have already signed the declarations but organisers did not give any indication of how many or whether the rules had deterred any players from entering.
"We listened very much to the feedback from last year," AELTC chief executive Sally Bolton said. "And that feedback from the [Russian and Belarusian] athletes was that they wanted the choice to be able to sign the declaration.
"We've spent a significant amount of time engaging with those players to ensure that they fully understand what they're signing up to. And, at this point, we have a number of players who are in the process of signing them or have signed."
'Amended' security and other changes
Sporting events have been disrupted this month by protesters, with both the Grand National and World Snooker Championship targeted by different groups.
Asked whether security would therefore be heightened at Wimbledon, Bolton told BBC Sport: "Security will be amended to address the type of risk we think exists. So rather than specifically heighten it, we might just do some slightly different things this year."
She added the AELTC was taking advice from the Metropolitan Police and others with "experience in this space" and emphasised Wimbledon's sustainability efforts when asked about potential protests.
"We are really passionate about delivering on our commitment which is to be environment positive by 2030. Our sport is played on grass here. It's really important to us that we have an environment in which that surface can thrive," she said.
"This year we have put proper power into the queue using our sustainable power source, we're reducing the number of petrol and diesel cars in our fleet and we're looking at retention of rainwater to water the courts."
Other changes at Wimbledon this year also include:
Men's doubles to be played as best-of-three sets instead of five-settersWheelchair event to be played over an extra (fifth) day to allow for greater recovery time for players doing well in both singles and doublesFemale players allowed to wear dark undershortsTrial of on-court coaching during matches (in line with other Grand Slams doing one-year trial)Players given refillable water bottles to fill up on court to try to cut plastic waste.Will Federer and Williams make trip to SW19?
Tennis has lost two of its biggest stars to retirement since last year's Wimbledon, leaving fans wondering whether Roger Federer and Serena Williams may return to the stage of some of their greatest triumphs to say a 'proper' goodbye.
Bolton said she was "very hopeful" eight-time men's singles champion Federer and seven-time women's singles champion Williams "may well be in town" but that as yet it was not confirmed.
Organisers said they were planning to celebrate Federer's career, without giving details, and also that Billie Jean King would be a special guest as they mark the 50th anniversary of the WTA.
