1. By air: There are direct flights from Anchorage, Alaska to Petropavlovsk-Kamchatsky, Russia. The flight time is approximately 5 hours.
2. By ferry: There is a ferry service that operates between Seward, Alaska and Petropavlovsk-Kamchatsky, Russia. The ferry trip takes about 2 days.
3. By small boat: It is also possible to cross the Bering Strait in a small boat, such as a kayak or a sailboat. However, this is only recommended for experienced boaters, as the weather conditions in the Bering Strait can be very dangerous.
In addition to these options, it is also possible to cross the Bering Strait on foot, but this is not a recommended option, due to the harsh weather conditions and the risk of being lost or injured.