Al Jazeera can sometimes be biased in their reporting, but this article seems to be a fair and balanced summary of the current situation. Note that a lot of leftist leaders are questioning the integrity of the election results, alongside Western media.

But Putin and Xi have both expressed their congratulations for Maduro's "win", because authoritarians gotta stick together, right?

TLDR:

• Venezuela’s electoral authority declared President Nicolas Maduro the winner of Sunday’s election with 51 percent of the vote against opposition candidate Edmundo Gonzalez’s 44 percent.
• The opposition not only disputes the official results but says Gonzalez won the election with 70 percent of the vote, adding it has the data to back it up.