Well we all know better than to believe anything Trump says. And there's quite a bit of evidence that masks do work, but that takes specific conditions such as their use being universal and that they be used correctly. One infected person not using a mask will be spreading the virus wherever they go and your own mask wearing only parttially protects you from that. Better than doing nothing which is what Trump wants people to do.
Doesn't appear to be true, most people only infect others within their own home, and that can only happen while there is someone left at home to be infected, even then it is not certain to happen. Spreading within the home isn't really a problem, it doesn't allow the epidemic to continue for long.
There are a few situations well known for spreading virus such as meat packing plants, but you can only infect the entire production line once, so they don't keep the epidemic going for long either.
The spread that causes the epidemic to expand is from the super-spreading events, which appear to be caused by a very small number of people, maybe 1 in 50, in a small number of situations. Stop those events and the epidemic will die out. This is what the USA is currently failing to do while others have been succeeding. Above all, everybody needs to limit the number of strangers (infrequent contacts) they have contact with, the exact opposite of Trump's church visit. As soon as that R is below 1.0 the epidemic will die out, R will drop below 1.0 very quickly if nobody has contact with people outside their family, it will still drop below 1.0 reasonably quickly if contacts are limited to family and regular work colleagues. Closing down bars, theatres, music events, religious events, participation in sports is far more important than wearing masks.
Social distancing and frequent hand-washing are still the most important self-protection techniques, and that hes been fairly well proven.
An extra meter distance is roughly the equivalent of properly wearing a mask, is roughly equivalent to halving the contact time, is roughly equivalent to wearing glasses, is roughly equivalent to not touching your face, and hand washing can help too.
They should all add up to help, however wearing the mask tends to result in reduced distances, frequent touching of the face (mask), extended contact time, reduced hand washing, and masks are frequently not worn/removed/disposed of correctly.
Of course developing and producing a vaccine will have more effect than any of those measures, haven't heard much from the USA about successes on that topic either.
British drugmaker AstraZeneca Plc says it has agreed with the Japanese government to promote talks on supplying Japan with the experimental coronavirus vaccine it is jointly developing with the University of Oxford.
english.kyodonews.net
In Tokyo, Chief Cabinet Secretary Yoshihide Suga told a press conference, "The government is firmly working on securing the necessary vaccines for Japan." Given the expected surge in demand, concerns remain that supplies of foreign vaccines may be limited and not available to people in Japan.
AstraZeneca, which is seen as among the leaders in the race to develop the world's first vaccine against the coronavirus, has said it is committed to offer access to the vaccine at no profit during the pandemic and is boosting production. It said it will start commercial supply of the AZD1222 vaccine, currently under late-stage clinical trials, from September.