[Timesink]

Can the ISS be left unattended? It regularly fires rockets to counteract orbit-decay. Even if this could be automated, it needs a resupply of fuel.

It can be left unattended indefinitely as long as astronauts can at least get up there occasionally to perform maintenance. Without that minimal level of maintenance, though, the ISS runs a serious risk of becoming uninhabitable. And, of course, all the experiments and stuff currently on-board would be lost.

[RadioAstronomer]

Can the ISS be left unattended? It regularly fires rockets to counteract orbit-decay. Even if this could be automated, it needs a resupply of fuel.

It can be left unattended indefinitely as long as astronauts can at least get up there occasionally to perform maintenance. Without that minimal level of maintenance, though, the ISS runs a serious risk of becoming uninhabitable. And, of course, all the experiments and stuff currently on-board would be lost.

Remember, the Russians still can fly crews to the space station.