From East:  train to station Karpaty (Karpati), you will be met here. Otherwise  negotiate with private drivers  to Vodogray complex., 5-6 km

From West: 

EU citizens  don't need visa to enter Ukraine, for other nationalities, please consult Ukrainian consulate in your residence country for formalities and ask the organizing committee the official invitation letter  

by plain to Budapest and then by train to Chop station:  we recommend this option as more rapid and economic.

 Budapest airport (BUD) is served by principal world air companies including Hungarian Malev and low-cost Easy Jet, Wizz Air, and  TUIfly,  (use e.g. skyscanner for planning)

Upon arrive, you can reach the railway station either by taxi or by metro, taking the public bus 200E to Kőbánya-Kispest metro station  (1h-1.5h, see also the information at the airport web site).

Budapest Metro Map  in pdf

There are several trains from Budapest to Chop - first Ukrainian railway station where  participants of the conference will be met if communicate the arrive time in advance here.
Don't confuse Budapest-Keleti and  Budapest Nyugati stations.
In majority cases the correspondence at the last Hungarian station Zahony should be done.

Consult the train timetable (German DB site)

We recommend to take the direct train: (no correspondence!) Budapest-Keleti 18:40 - Chop 01:13 (around 20 Euro)

Examples of travel:

1) 12:25 Paris Orly – 14:35 Budapest (67 EURO by EasyJet), then Budapest-Keleti 18:40- Chop 01:13
2)  13:00 Milan Bergame  – 14:30 Budapest, (53 EURO by Wizz Air),  then Budapest-Keleti 18:40- Chop 01:13
(indicative information about flight prices is given on 5th of April, prices will increase more close to even )

by plain to Kiev and then train to Karpaty station

in International airport Kiev-Borispol take the direct bus to principal railway station: (1h).  Taxi is not recommended.  Take the direct overnight train to Karpati station (14h, 30-40 EUR): Give the preference to ticket in  4-person compartment in sleeping car.  Couchette is not recommended. Convenient trains: 18:58-09:02 and 20:12-10:16. Communicate the time of arrive here.You will be met at the station. Otherwise  negotiate with private drivers  to Vodogray complex., 5-6 km

Consult the train timetable (German DB site)