If you look at the panel at the top right, you will see that he is nowhere to be seen, then in the next panel after that, he is apparently "close" this leads to 1 of 2 conclusions.
1.) They zoomed in on the "lens" of the portal, if you want to think of the portal as a telescope
2.) Sasuke came from nowhere using his foot speed and managed to get close to it.
All incorrect. The portal wasn't big enough for them to see Sasuke through it. In the second panel of the page, the text bubble with the exclamation mark indicates that as the portal got bigger and showed more of the desert, they saw Sasuke. The panel directly under that, which occurs AFTER they see Sasuke, shows Sasuke being surprised at the portal being there. What really happened, in this order, was:
1. They made portal
2. Portal got bigger and bigger, showing more of the dimension as it grew
3. Initially, it was too small to show Sasuke, but it got bigger and they saw him
4. Sasuke
then noticed the portal
5. Failed to get to it just by running.
It makes no sense they got to VOTE in another country using just foot speed.