Russia Offers Vaccine To U.S. After President Trump's Virus Diagnosis

Russia announced Sputnik V as the first COVID-19 vaccine, offering to work with the US, which declined. The vaccine showed antibody results in trials but was initially tested on only 76 people. Now in phase three with 40,000 participants, it has attracted global interest. Other vaccines, including those by Moderna and Astra Zeneca, are also in phase three trials.

What phase is the Sputnik V vaccine currently in, and how many participants are involved?

Which two companies are mentioned as having vaccines in phase three of their trials?